Mast cell activation

Does anyone know if there Is any known/suspected relationship between. Undifferentiated connective tissue disease and mast cell activation syndrome?

I am just now getting tested for Mast cell disease. I have a diagnosis of mixed connective tissue disease (from biopsy) and have been on Plaquenil for 3 years (Methotrexate for 1) for diffuse bone pain and continuous low grade fevers. Have had no positive ANA. Have had allergic reactions consistently for 15+ years and sporadically in the middle of the night (after 2am) with no obvious cause. I will let you know if I get any answers.

Terry