I Am Itching All Over And Have A Dreadful Rash

I am itching all over and have a dreadful rash on bot of my legs. I also have a horrible taste in my mouth, little or no appetite, and occasional stomach cramps. This is afte only two doses of the drug. AsIam80 years old all symptoms are scary.SouldI see my docto tomorrow? This was prescribed by Care Spot on Sunday for symptoms of high fever and a urinary tract infection was discovered.