I'm sorry if this is strange, but I am trying to decide what to do. I woke up today feeling very lightheaded. I'm fine when sitting, but am uable to function properly. Ihave a strange feeling that my TSH is off and the reason I feel this is because I have been extremely exhausted for several weeks. I am on 250 MCG of synthroid. My question is I can go to the doctor at 2 this afternoon, but my bloodwork won't be back for a week so I won't really know, or should I go to the ER because I will get result back soonr. I feel a little bad doing that because it isn't an emergency. Also, I'm not completely sure it is related to my thyroid. Oh, I am on synthroid from cance 2 years ago and had my thyroid removed and rai back then.