Yes, please go to your doctor. I had hair loss a few years ago, and my hair was falling out pretty badly and I had to go to the doctor. Turned out I'm allergic to iodine and the vitamins I was taking had about 300% more than the daily recommended allowance.
In other words, I would have never figured out it was my vitamins! Go see your doctor. It could be something you just did not think of. But, no matter what the cause, you need to have it checked out.