I’ve thought about that night a lot over the last three years. The moment my immune system shifted permanently. My utter naïveté about what could happen to a body. Although I’d taken many premed classes and had quite a few health problems in my life, it really never occurred to me that I wasn’t unbreakable. Or, at least, if I broke, I assumed I’d be able to be fixed if I put in the work.

I had been diagnosed with Graves Disease a few years earlier, told it would kill me without treatment, had radioiodine ablation on my thyroid and had to avoid people for two weeks. And, during all of this, I never took a day off of work. It also never crossed my mind to get a second opinion or talk to others with the same condition or change my eating and sleeping habits. I just popped the radioactive pill and got back to work. The same month, I was told I had reactivated EBV by a naturopath and was advised to cut back my work schedule from 55 hours a week to 20… Ha! I’m sure you can guess how that went. I never saw that doctor again. I was too busy.

I had never been intimately exposed to chronic illness, so I was completely ignorant to the toll it could take on a family. I imagined it would be hard, of course, but you can never understand without experiencing it. Everyone in my family is healthy, even my extended family. We have our demons, but they’re addictions, mental health problems, typical old age conditions. My siblings are all in their 30s and 40s and haven’t had more than the occasional cold. My parents are in their 70s and both still work and are active and social.

I was a sick baby. People would famously stare at the itty bitty girl with the old man’s deep cough. I had my first major bout of angioedema when I was 23 and went into anaphylaxis for the first time when I was 28.

If I’d understood what could happen to a body, if I’d been less in denial, if I’d been less concerned about proving my bullet-proof toughness, I might have looked back on my childhood and my chest infections, thyroid disease, vasovagal syncope and all the symptoms that turned out to be mast cell activation disorder and tried to make changes to protect myself.

If I’d understood what can happen to a body, I might have tried to nurture what was obviously a sensitive system, armour myself against external assaults and preserve what was still working. I could have eaten food that didn’t come from a restaurant kitchen. I could have taken a vitamin once in a while and stopped drinking all of my water out of cheap plastic bottles. I could have made sleep a priority, quit smoking and drinking sooner and not married a job that turned a run-of-the-mill control freak into a spread-too-thin obsessive perfectionist, trying to do all things, everywhere, first and best.

It’s been exactly three years since M.E. shuddered through my body and I wonder if I’ll ever stop thinking about the life that I lost that day. I would take all of my previous health conditions over this one. It was like a death: of my career, of my strong body, of ignorant bliss, and of our future dreams.

I think about the months leading up to it — the blatant warnings of a body in crisis that I chose to ignore. There was a nagging voice in my head that pushed me to make a will, living will and power of attorney the year prior, at the age of 36, even though I had no kids. That same voice made me insist on a quickie marriage in our back garden after my husband and I had already been together 13 years. I romantically said that I wanted him to be able to speak for me if I became incapacitated and I wanted him to have legal recourse and rights if I died. Deep down, I sensed what was on the horizon.

I made sure to do everything I needed to do for luck during our ceremony: old, new, borrowed, blue, coin in my shoe… We signed the papers on the patio table and, half way back to the kitchen to grab our lunch, I remembered the last thing needed to insure we didn’t jinx our new life: he carried me over our backdoor threshold. We didn’t tell anyone because we thought we’d have a proper ceremony with friends and family in the next year or two – maybe in Ireland or somewhere exotic on a beach. It was exciting to dream up plans for a wedding after so many years together. That was 44 days before my Halloween sickness.

My life feels like one of those Choose Your Own Adventure books that I adored as a kid.

Move back to Ireland after college, turn to page 63 or drive across America to Seattle, turn to page 82.

Work your way up the restaurant corporate ladder, turn to page 103 or go to grad school for nutrition and dietetics, turn to page 123.

Jump in the lake in Virginia, just once, for only a few minutes, turn to page 146 or stay dry and don’t catch whatever is going to land you in the ER, wipe out your gut flora and set your immune system up for failure, turn to page 160.

Run into Walgreens on the way home from work and get a flu shot, turn to page 184 or keep on driving and live the rest of your life never having heard of myalgic encephalomyelitis, turn to page Happily Ever After.