I Am On Januvia For Two Weeks & Have Developed

I am on Januvia for two weeks & have developed severe itching & swelling of lower limbs. I have also had two heart stents in the past two months & have done so well with that. I have never had problems with my legs or feet & stay active. Please help me to feel well again. The only relief I can get is running warm water over the limbs & the itching will ease for about two hours.