Hi Jane54,
I'm unaware of any yellow card-like system here in the states. My wife's symptoms have continued (better one day, worse the next) and yesterday she contacted the local clinic and her oncologist (she has CLL) and was prescribed a stronger decongestant by her oncologist. No response from the clinic. I think much of the meta data comes through using ad hoc communications similar to this. Likely, my wife's correlation data (Covid and CLL, outcomes) will get aggregated somewhere. As I mentioned, there are directed small case studies looking at statistics involving Covid vaccines and possible side effects; but more on the various strains contracted by people with pre-existing conditions like epilepsy and CLL.
I also suspect there are a number of folks in the states who've gotten Covid with mild symptoms and not reported anything nor gone to the doctor. So, the actual number of disease contractions is significantly higher. i tested yesterday and was negative. I have not taken any more Covid boosters since November and also have not had any more seizures since early January. Proves nothing, of course. I also quit drinking any alcohol in January. I used to indulge in a Sunday afternoon Martini or two, or an IPA while soaking in the hot tub on a winter's day. I read that alcohol was a seizure trigger so I quit. Not saying I don't miss it, nor that there's any conclusive evidence that's the reason I haven't had any seizures since. But, good enough for me.
The longer the Covid era evolves---the vaccines, the masks, the mandates, the new strains, the new data, the illness correlations like we are discussing, the possible repression of some data, etc. leads me to believe Covid is becoming part of our lives and has to be dealt with as we see fit. Likely, an annual or semi-annual vaccine for the major strains will be introduced--similar to the flu shot. Not sure yet if I will take it or not.
Finally, I read that a university hospital in the eastern U.S. developed a new strain using two existing variants (more gain of function experiments). Maybe they'll discover a vaccine that works once and for all against all variants, or develop a strain that is increasingly deadly and mutates constantly. Stay tuned.