Why is MCAS getting worse?

It was either my second pregnancy, covid or the vaccine that caused my PoTs/MCAS symptoms. I noticed symptoms 4 years ago and more specifically after covid 3 years ago made worse by the vaccine 2 months later.

I've only just realised that I've got MCAS the last couple of months as symptoms have really ramped up. Congestion, ear fullness, sore throat after eating, runny nose, burning/flushing ears and cheeks etc as well as a couple of hives.

Any idea about why this would be happening 3 or 4 years on from potential cause of this in the first place? I don't want to get worse!