I'm a lot like you. I think that the doctor will think I'm a hypochondriac. Especially more now since one doctor I had told me that I have a weak mind and that this thing I had wrong with my throat had to do with what I was thinking. Well that's fair enough, but he didn't refer me to mental health or counselling. He was good at giving the right answers but not at helping me. I left that doctor and finally found one who did something about getting me help.
If you were at the doctors every week with something wrong then they might think, 'oh here she goes again.' But you're not there every week. It'll be ok. It's good to go to the doctor if you are worried about something. Fainting is not something to ignore.