Dizziness with medications and exercises

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My probleme is since many years I have sufferred from dizziness, feeling faint, always tired and i am dealing with these symptoms for almost every day.
At home, workplace, daytime, nightime, i really feel desperate, i don't even have a social life, no friends, no relative because i don't want people seing me like this all the time.
I can't do sport anymore, i am afraid to get out sometimes because i feel i am going to have a panic attack or somehing else bad.
I can't travel anymore, i lost all my passion, the only safe place is my home, at least if you feel faint, dizzy, weak or many more i can get lay down or relax
And the biggest and sadest nightmare for me is, I been to a tons of doctors, they did everything for me, they can't find nothing wrong, mean maybe there is nothing serious, but i don't really believe it because i feel so bad, i feel others synptoms i can't explain because i don't know what it is.
Thank you.