Is this really hypothyroidism?

Hello, I went in to the doctor because I was having a few odd symptoms. My two main reasons going in was I had frequent urination especially at night time and unexplained rashes (red that is a lot like excema but not) I was having a cold intolerance along with feeling very depressed and irritable. The doctor did a CBC. My thyroid was elevated, my calcium level was just barely high, and my EGFR was messed up as well (84 and they said it should be about 120-100). The doctor put me on a thyroid medication for hypothyroidism and retested my thyroid (TSH). I started the medicine, reluctantly, and shockingly am feeling better. But, I received my TSH level and it was normal (before being on any medications). I am still going back in 2 weeks to retest the EGFR. But, I am wondering if this is not hypothyroidism at all. I certainly do not want to be taking a medication for this if I had one test that was high and the second was normal. With three tests elevated could it indicate something else? Any thoughts?