beta blockers

So a little update on what's happening with me. I don't have ME. I have post viral POTS and chronic bounding pulse. It's just this community was the closest I could find where I could interact with people with similar symptoms. Recently however I discovered a post on reddit that lead me to join...

I do not know what happened however after my decline in health started then I prodce allergies to different drugs , herbals, foods. beta blockers are one of them . I need to use them cuase I got arrythmias mostly tachcarydia however they give itching and red spots. Is it a sign of MCAS? I have...