Blood and Heart arrthymia

I have had Heart Failure for 8 years. I am fortunate because I have never been hospitalized. For some unknown reason my anxiety has escalated. I get flushing with the least little problem. Doctors have no answers for the flushing, definitely anxiety related. It is very uncomfortable as my face feels like it is 100 degrees. So bad I went to Emergency Room this past Friday. Vitals all good and Dr prescribed me a med called Hydroxyzine. Seemed to help a little but it is a med you take as needed up to 4 a day. However, side effects can be QT prolongation. Not good. Has anyone experienced bad Flushing and found a way to treat it? Thank you!