Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services if you develop signs of anaphylaxis, including:
If you have been prescribed an adrenaline autoinjector, use it immediately according to your emergency plan, then call emergency services.
Symptoms can return after seeming to improve, so medical assessment is still needed.
Routine follow-up is the right place to discuss ongoing flushing, itching, digestive symptoms, fatigue, medicine side effects, trigger patterns, bone-density results, and whether your emergency plan remains suitable.
Seek prompt medical advice for a major change in your usual symptoms, repeated reactions needing adrenaline, severe or persistent abdominal symptoms, an unexplained fracture, new persistent bone pain, unusual bleeding, or unexplained weight loss.
Every sign above is quoted from the sofidex article on Indolent systemic mastocytosis. If you are not sure, err upward — it is always reasonable to be checked.