Honestly scared about possible diagnosis

I’m so scared and lost on my whole dsyautonomia journey. I got diagnosed with POTS last month, and my doctor suspects MCAS but I don’t see her for that for another month. Last week I accidentally ate my worst allergen (oats) and I had no EpiPen, so I was rushed to the ER via ambulance for anaphylactic shock. Ever since then I’ve been having such bad histamine responses that allergy medication isn’t helping. My throat feels tight, my eczema is flaring bad, I’m constantly sneezing, congested and sometimes I feel like my breathing is just a bit harder. I know I’m not going anaphylactic, but all of this is very sudden and new for me.

I went on a deep dive about MCAS since my doctor mentioned it was histamine related and I regret doing so. Maybe it was just the medical information I found but MCAS sounds really, really scary. With having MCAS as a possibility and my POTS diagnosis I’m having a hard time staying positive. Does anyone have any recommendations of what I can do to treat the histamine response?

Some info: I got POTS and possible MCAS symptoms after I had my daughter 10 months ago. I’ve had my food allergies since I was in elementary school.

Thanks everyone!