Posted 3/22/2016 10:52 AM (GMT -5)
What you've been through sounds like more than IBS, but it doesn't sound like a stricture. It sounds like you had a GI bug (hopefully not c. diff as that's a nasty bugger). Carry on eating a little bit every day, even if it's uncomfortable. Not eating will have made your bowels seize up and you need to get them going again. You couldn't have been constipated when you strained so hard to go: you'd had 3 days of severe diarrhoea and then didn't eat anything after that. Even if you had been constipated, it's still not a great idea to strain really hard to go. If the urge disappears, don't force it. Sit on the toilet awhile, wait to see if it comes back, push if it does, stop if the urge completely disappears again.
As for tests, I dunno what to advise on that front really :/ Maybe wait a few days to see if you get over this first. As miserable as it all is, normal blood tests show that you're not dangerously ill.