What Causes Numbness,muscle Pain And Weakness?

i just had a tavanic ang im on it's 2nd day, on its 1st day i had some numbness, muscle pain & feeling sooooo weak + some rashes in my ledt upper portion of my arm, as per my dr i have to taka another one now i had some large spots in my lower back some tingling sensation and feeling weak still is this still normal or should i stop taking the pill