Hello, Please bear with me; this is my first time posting a new topic. I developed POTS symptoms two years ago at age 17, three weeks after donating blood to the Red Cross (didn't know at the time I probably had low blood volume). I remember at the time the lady had difficulty finding my vein, but since I was in the healthy weight zone, I thought nothing of it. In the next six months or so, I got sick with many things (including strep throat, for which I took antibiotics), and that was also around the time I got motion sickness and digestive problems (diahrea (sorry!)). My question is, could donating blood have triggered POTS? Or did it just make me more likely to get it, and then one of the bugs finished me off? I'm not even sure it matters why I got it, but I was just curious. My second question is (and this is more important), when people have digestive issues like I've had for two years, and they start at the same time as POTS, is that POTS itself? Or is it something else? I have weird sensitivities to gluten, dairy, artificial things like red dye or processed meats, more than a couple spoons of vegetables, etc. but before two years ago, I was able to eat whatever I wanted, however much I wanted. Like I used to drink 6 glasses of milk a day, eat 5 slices of bread, etc. Now I take Immodium a few times a month. Why might this be? I never vomit, so it can't be gastroparesis, right? Though I do feel full after eating, and eat very quickly to get it all down. It's okay if nobody knows what it is - I've sort of learned to adapt. It was so bad about six months after I first got POTS - I almost couldn't digest anything and lost 10-15 pounds, but now as long as I don't eat too many "trigger" foods, I only need immodium a couple times a month. I know this sounds weird, but my digestion improved with regular exercise - maybe coincidental. Thank you for your time!