My hands are purple and my legs are blue. I started a new stomach medicine about 4 weeks ago. Earlier today I got really hot and flush, I about passed out, what could be the cause of this? This didn't start until I started this medicine.

We know absolutely nothing about you. Please call your doctor's office, call or better yet show it to your pharmacist, and consider going to the ER.
Yes, some medicines tend to cut off circulation to the hands and feet but yours sounds pretty extreme and could be the medicine, it could be ANYTHING.