Does anybody else ever experience problems with EP due to gravity?

As I mentioned (bragged?) recently, I'd been doing a lot better lately and was getting out of the house more often. Well, yesterday I tried to go shopping at a health food store (no, *not* the one where I used to work -- it'll be a cold day in hell before I ever give *them* any of my money ever again...) In any case, I'd only made it halfway through this small store when the pain started returning and doubling me over to the point where I had to get back out to the car to sit down on my donut pillow. The pain seems to return like that whenever I stand or walk for for than 15 or 20 minutes at a time, even though I *am* wearing a supporter to keep things from swinging around. Has anybody else ever experienced anything like this?

Also, I'm not sure if it was related or not, but immediately after I ate a cold salad dish I'd bought in the health food store, I got so sick to my stomach that I nearly vomited right there on the parking lot, even though it didn't contain anything I'm allergic to. (It was just lentils, brown rice, peas, carrots and olive oil). I was really sick and back in bed for the rest of the day after I got back home, and the EP pain has increased again ever since too.

I guess I've just been overdoing it lately, but it sure seems like gravity tugging on things while I'm walking around immediately makes it worse. Has anybody else ever had this problem?