Pressure feeling on just forehead, tingling on scalp, sensitive to light - Dr doesn't know what it is - any ideas? The pressure is pretty constant.

Couple of thoughts. 2 possibilities (emphasis on "possibilities"): 1) medication side effects; 2) a mild migraine variant. If you have a personal or family history of migraine, that is worth considering. The scalp tingling and photophobia are suggestive. If that's what it is and you've never had headaches, you may start getting them. If you doc advises you just to wait and see what develops if anything, I concur.