i am on 40mcg of t3 from gp and as i still dont feel well he increased it to 60mcg split throughout the day but i seem to get toxic and feel evern worse. have cut down again but feel so tired and piling on weight. i cannot tolerate thyroxine. should i have any blood tests done privately to see if anything wrong. i never feel well and am in chronic pain as well and severe fatigue. i am willing to pay for tests.