I have been taking escitalopram (feliz-s) 10 mg for about a week and I'm starting to have difficulty breathing. Should I stop my medication?

Yes and be seen now. Any new symptom in the setting of a new medicine should raise the possibility of an allergy. Not breathing well is a scary and serious problem. Please be seen right away as other things can cause it. As you have only been on the medicine for a week, it is likely safe to stop now, but talk with the physician immediately.