This MastAttack.org page may describe what I have been doing through:
“Mast cell activation syndrome (MCAS) (also known as ‘Mast cell activation disorder, or MCAD’) is when a normal amount of mast cells behave badly. It is clinically similar to indolent systemic mastocytosis; life span is normal; biopsies are negative.”
Wikipedia also has a good mast cell activation syndrome page. Both pages cover the MCAS/MCAD symptoms very well.