TSH lower end of normal, many hyperthyroid symptoms...

I've been here before but I now have a better grasp of my symptoms and more information to work with, so I have some questions...
My thyroid has been checked, and most recently my TSH was 0.6. My T4 was normal on that paper but I was once told it was borderline high. Not sure about my T3.
I have IBS-like symptoms (frequent bowel movements, painful gas), anxiety, fast heartbeat, heart palpitations, need to eat about every two hours, feel more awake at night (I do sleep for a long time though, which I don't think is consistent with hyperthyroid, although it may be from my antidepressant), low tolerance for heat, and some lightheadedness. Had some hairloss in the summer but it has slowed down a lot, and I am seeing more veins than I used to in my hands, wrists, and face which tells me my skin may be thinning. Oh, and I used to be a caffeine junkie, now I have a pretty low tolerance for caffeine. Used to drink a few cups of coffee or two energy drinks plus some diet sodas every day (not healthy, I know), now I drink part of one diet soda a day.
Any advice?

Post Edited (lindsay0891) : 12/11/2012 12:17:13 AM (GMT-7)

Thanks. :) Funny you should ask, my calcium level is very slightly high (only 10.4). Doctors aren't concerned about it but finally one checked my parathyroid just as a precaution, but it was normal. So my calcium level could be caused by something else, probably nothing harmful since it's not rising and is barely high.

Are there two different tests for it? Because once I was told it was borderline high, and once I was told it was normal. Also I remember when it was borderline high they said it was 12.1, but on the paper I have now the values are very different and the number is like 1.6. Is it free T4 vs. total T4 or something? Which is more accurate?

Just checked, the one I have on paper was for free T4, it was 1.44 with a range of 0.82-1.77. So it must've been the total that was borderline high at the other lab.