Lexapro and constipation

I've been on Lexapro 10mg for about six months now. The major side effect for me, is the constipation. It just seems to keep getting worse and worse. I used to go 3 times a day, now I'm lucky to go 3 times a week. And I constantly feel bloated, and stomach pains, but also weirdly hungry. So many times I feel like I need to go, but just can't. I feel like my bowels have stopped working. I don't know how much longer I can handle this. I was on valium for a while, untill my doctor decided to take me off and try the antidepressants instead. Valium never gave me this side effect. And I've tried all sorts of things, natural bowel supplements, laxatives with senna, prune juice, eating fruit and veg, drinking plenty of water, magnesium., expensive probiotics,. Nothing has helped. Anyone else experience this, and did you overcome it?