I have a complex, multi-systemic disease called ME/CFS and MCAS is a common co-morbidity. The specialist who diagnosed me with ME/CFS also diagnosed my MCAS.
I am sorry your life has been stolen by illness. Only those of us who are chronically ill can understand the grief, the loss, the endless torment. In your original post you said your problems were caused by an infusion, that sounds just awful. Are you getting proper care? Was it an allergy type reaction?
My disease is post viral, autoimmune and neurological, which basically means I got a harmless virus which pushed my immune system into overdrive and it's been attacking my body ever since.
I don't cope at all, that's why I am here. I lost my career, my job, all my hobbies, all my friends (as I cannot interact socially), everything that was me. It's a living nightmare with no end.
I keep hoping there will be a medical breakthrough, I've been hoping for 14 years. Most days all I see is darkness and despair. But I am not ready to die because I have people who love me so, so much and also because I have a huge desire to walk one more time in the forest, and to swim one more time in the sea, before I draw my last breath.
I understand you are scared. Yes, it can get worse, but it can also get better. It's a matter of luck.