I know I know, I worry too much about my health, but here we go:
Every time I get really tired, I think that there might be something wrong with my body (thyroid problem etc. - yeah, you can laugh about that, cos I do too). What do you think - which "level" of tiredness is normal? If you're normally lazy and have to get used to doing something every day, is it normal to get tired quickly? I think I worry too much.

I exactly know what you mean 'cause I also worry too much about my health. Even when everything is OK i'm afraid of cancer of another serious illness.
Am I hypohondriac?

There's nothing wrong with being concerned about your health. I think you should go in for a physical.

Probably! I think that most of the time, I get tired when I'm bored/depressed etc., and that it's not so much because of my "poor health" (I'm actually quite healthy).

i feel the same, i think most of my health problems are effects of my psychical and mental condition.
for example when i'm depressed then i weaken
i had been addicted to drugs for a few years and i now i 've got results of it