If I were you I'd worry about lung function. That is something you might want to speak with a doctor about.
I think the individual risk of a COVID vaccine is probably pretty minor, however it still remains to be seen how long term repeated use will change things and it wouldn't surprise me if some people had long term health complications stemming from them. That said, given your persistent symptom you may indeed be a case where COVID has caused persistent damage.
In the hospital I was told I have some lung scarring, not sure if that heals or not. If I don't get back to precovid cardio levels in the spring I may see if I can get another xray.
For hospitalized pneumonia patients it is not unheard of for it to be 6 months or even longer to regain full function. The Covid pneumonia was the tough part, it's bilateral.
I know I have lung damage from being a smoker for many years. When they did my my lung function test years ago as part of my sleep study, they told me my lung volume indicated I was a smoker but my good 02 uptake indicated I was an ex smoker.
I still have a little frog in the throat but have no problem knocking out a 20 mile bike ride on the road at a decent clip. My mountain biking isn't nearly as strong as it was, but the loss of muscle mass is probably the main cause of that, you need strong legs to climb hills.