question: My 17 year old daughter was diagnosed with POTS in January (after 5 years of incorrect diagnosis). She is currently taking midodrine 3x daily for the fatigue and joint pain. The cardiologist we are currently seeing feels she may also have mast cell instability, since her allergies to foods are becoming more severe. I cannot find much information on this. Do I go back to the immunologist? Is it diagnosable and treatable?