Rose, do a good parasite cleanse to rule this out as being the problem (paraway brand "paragone"). Once you're done this (I would do 2 kits; you will find some weird things coming out of your stool in the first 2-3 days...don't look if you're squimish)
Once you're done this, then do yoga for the abdomen/intestines. And voila, problems all gone :)