Not the GP, but I also had a severe reaction to my second Moderna shot. All in all, I felt ill for 8-9 days. It was the most unusual illness I have ever felt, though I should say that I do not get sick very often.
It started in my head and progressed it's way down to my legs. The day after the shot, it started with headaches and eye strain with a tremendous amount of head pressure, not dissimilar from an ocular migraine. That developed into a full blown head cold of congestion, coughing, stuffy, runny nose, and continued headache. The headache went away and it began to feel like strep throat, the coughing fits, while not excessive, were pretty rough and were burning my throat. From there it went into my chest and I felt like I had bronchitis. This was the worst phase of it. That burning sensation in your chest cavity when you have bronchitis? It felt exactly like that except I was also extremely, extremely tired. I slept for almost 2 days straight while this was going on. I took time off of work during the throat and chest phase of this. After that, I had stomach cramps and diarrhea. Then, after all of that wacky bullshit ended and I started to feel like a human again, I was left with cramps in my legs.
I was also extremely tired the entire time. Just the simple act of walking both hurt and made me more tired. It was fatigue like I've never experienced before. I'm a veteran and I've gone through some sleep deprivation training and that was nothing like the fatigue that I experienced from my reaction.
My wife was 5 months pregnant while all of this was going on and our twins were about 22 months old. It was, honestly, complete fucking bullshit. Being sick coupled with the fact that I had so many people reliant on me really stressed me out. I was able to get my mother-in-law to lend a hand but we went from thriving to surviving until I was on the tail end of the thing.
But what bothered me the most was that I couldn't even report the fact that I was having a reaction. I called up the UC medical system where I received the shot and they told me to follow up with my GP, except that at the time I didn't have one. I called them back a couple of days later and I could basically hear the person shrugging their shoulders.
Goodness! I'm so sorry to hear that. I also had a terrible, week-long illness after the same second shot, which is why I'm extremely apprehensive about our governor mandating boosters for myself and others working in this particular industry. They've become extremely draconian about not allowing exemptions, and in your case at least, I hope you'd be eligible for an exemption for a following shot. But the way things are going, the powers that be want to force everyone to get a new shot every 6 months. I want to opt out of that system entirely.
