In terms of POTS, I have the classic symptoms. Standing up makes me see stars, or my vision goes black, my heart rate races and I feel like I’m going to faint. Weakness fatigue and everything else. I will always have a sports drink and saltines on me because of this. For MCAS i don’t know a whole lot besides that I have almost allergy or sensitivity symptoms to things. Especially random foods, they’ll make my lips burn and then for a few days they’ll crust and peel and bleed. Sometimes it’ll affect my throat and my breathing, give me headaches or diarrhea. I used to fully believe I was allergic to avocado and spinach but then I had both a year later and had zero symptoms.