I have fibro and gastroparesis, so I'm not sure if my reaction was the same as someone with fibro on its own.
With the first shot (Pfizer for both doses), I felt a little fatigued, and basically forgot I had gotten it. The fatigue went away within three days, which was surprising but relieving.
I knew that people tended to feel bad with the second dose, so I was preparing myself for bad flu symptoms (I usually vomit a lot, am bedridden, have a fever, and sleep a lot.).
However, within eight hours of getting the second shot, it was way worse than I expected. I had full-body pain so intense it woke me up and I vomited immediately. I mean, deep nerve, muscle, and bone pain shooting up around my whole body while also being a deep, burning ache. I couldn't stop trembling and twitching because if I stopped moving the overwhelming nerve pain would set in even worse. This all started at 4 AM, so obviously, I was exhausted, terrified, and deeply regretting getting vaccinated.
Throughout the day the pain got worse and worse (or maybe I just became more worn down by it. I was hard to tell). Nothing seemed to help. I couldn't stop vomiting; I wasn't even able to keep a sip of water down, let alone food or medication. I was able to move around, but that was only because I couldn't stop moving because of the intensity of the pain. I was crying, my lungs hurt, I had a migraine, I couldn't focus, I had a fever, and I was intensely hungry from all the vomiting.
By around 8 PM I was so weak from dehydration that I had to go to the ER. I could hardly walk, and I couldn't speak because I was hyperventilating from crying and gagging on my own saliva because my body still wanted to vomit. It also strongly impacted my mental wellbeing, as I was feeling suicidal and rather anxious the whole time.
I had to be moved around in a wheelchair to get to a bed where I received fluids, anti-nausea meds, and Benadryl through an IV. My twin sister, who also has fibro but not gastroparesis, helped me through all this and was rightfully horrified. Because of my reaction, she is considering not getting the second vaccine, and I don't know if that's a good or bad decision for her own health (and bank account, ER visits are expensive).
It was a terrifying experience for me. Honestly, I'm not sure if I've ever felt worse. I don't know if this is a common fibro reaction or a case-by-case reaction to the COVID-19 vaccines in general.
Side note I'm a 20-year-old woman and from the US.