I have felt that way before too. I agree with Biggieben that it's just from eating so much, that your organs are expanding.
For me, that is one of the worst sides I get from a cycle. It looks terrible eh. It usualy doesn't take too long to get ride of though.
If you're not already, maybe try doing shorter cycles. There might be less chance of that happening; or at least it may be easier to get ride of.
P.S. Pysllium seed husk, and those types of things are always a good idea to keep the food moving.