Senakot, lots of water and fruit helps with the uncomfy feeling, and hopefully gets some more regularity with your bowels. As for them coming closer together, a BA wont really change the way they sit on your chest, just makes them bigger and better shaped. I have a great sportsbra, that pulls them together, but they still sit pretty much the same when they are let loose. A good bra when you can wear them will make them pull and push together 
Hope you feel back to normal soon. x