Is there any tests to check for blood pooling? If you go through the works at a place that really knows about POTS can they check for this? I feel like either when I have to pee or have a b.m. that there is no more room left in my stomach. What this all feels like to me is when I was pregnant and I did have something in my stomach..that is what if feels like now. Along with the constant urge to urinate, pressure on the bladder. Thanks for the additional info on EDS. Is it your gastro dr that diagnosed you with this or a neurologist? I am just wondering who I should bring it up to. How do they check for it? I am still so worried there is some kind of tumor in there, but since I have had every test under the sun, including CT scan, vag ultrasound, abdominal ultrasound, small bowel x-ray and normal blood counts, etc etc etc, do you think I can rest my mind that this is not a tumor even though it feels like this? My POTS can on after mono in July. That is a nasty nasty infection! It is totally ruined my health and brought on all these cruddy symptoms.