That is really interesting. When I first started going out with my husband when I used to stay at his house I used to wake up in the middle of the night & throw up. I wasn't diagnosed with IBS then. For me I think it was coz I had a lot of stress with his ex girlfriend being at his parents house whenever I turned up.The odd thing was it never happened when we were at my parents house.Do you feel comfertable with the whole situation? I don't mean with him or with having sex I mean is there anything else bothering you? I was the same as you- very happy with him etc, well- we are married now so I don't think it was him.If anything is bothering me it goes straight to my stomach.Hope you manage to sort it out coz it can be a bit awkard when things are getting 'friendly'!