Agg. Systemic mastocytosis. This mean my anaphylaxis food/drug allergies will now end since on Cromolyn? Could ITP dx be part of ASM or can have both?

No, and No. cromolyn will not end probability of anaphylaxis, and if it happens needs to be treated, ITP isn't part of the disease, yes a patient can have both as separate diseases, aggressive severe mastocytosis is a rare disease, much rare than systemic mastocytosis, which is already a rare disease, diagnosis / management need to be in a tertiary care facility, need to adhere to treatment well & follow up.