I hyperextended my thumb a few months ago and it is still not feeling normal?

Get checked. If your injury was a few months ago, and you are still having discomfort, you should be seen and evaluated. There may be a sprain, an injured ligament, or other problems -- we can't tell what without examining you. Start with your primary care doc or an urgent care; depending on what is going on, you may or may not need to see a hand specialist.