Anyone using Xanax and Prozac together

Hi there, Im dealing with severe anxiety im off the balance feeling like i may fall down is anyone used xanax and fluxotine together im using 15mg prozac xanax dictir asked me to take half of .25 mg im on prozac 10 mg for almost 2 1/2 weeks first week was awful ended up in Er for heart palpitations second week 50% good week 3 awful again please somebody pour your suggestions how to deal with this Thank you