Some of the symptoms you report could be related to hyperthyroidism (over-active) - the heat intolerance, feeling hot and dizzy.
The weight gain would NOT be consistent with hyperthroidism. In hyperthyroidism people LOSE weight.
Weight gain can be however associated with hypothyroidism (under-active) - however in that case I would expect you to have cold intolerance.
Dizzy and blackouts are concerning - and I would agree with the need for you to see a physician for a complete physical examination and some testing. It is very difficult to give a good idea what is causing these various symptoms without a physical exam, some lab tests, probably an EKG. I do think it is reasonable to check your thyroid function as part of that workup (TSH and a Free T4)
Edited by FamilyPhysician on July 15 2006 at 9:51pm
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