I hear you!! I have had the same symptoms you have for the past four years. I also had vaccines but they were moderna, however I'm not sure if I got long term covid from the vaccines or from my initial bout of the Delta Covid virus. I got Covid before the vaccines were even available to the public. I can identify with your symptoms especially the dizziness and losing vision focus.
I have been reluctant to travel as well because of this. My symptoms like yours come and go, sometimes I can have a week or two before they come back and during these periods I try to take advantage of this time to get things done. I have had the same kind of experiences with doctors but fortunately found a PC that at least listens although there is little he can do to treat the symptoms. When I am having symptoms the only thing that brings me some relief is Tylenol. I have learned to pace myself as far as physical exertion is concerned becaues it tends to bring on the symptoms sooner. My life has changed because I was a very active person and enjoyed sports like tennis and hiking, I can no longer play tennis and my walks are relatively short one. I have had numerous test to try and identify what is going on but all come back normal. All of this has been very frustrating and somtimes depressing. All I can say is " hang in there". I am hopeful that research with find some kind of treatment in the future. Good luck to you, thank you for your service, from anothe veteran.