This may be the wrong place for this thread, so please move it to health issues, if you think it needs to go there. I'm just wondering how people know if they are lactose intolerant or have issues with dairy? I have been eating mostly a vegan style diet for a few weeks just for a change, but have had dairy on occasion for convenience, and it seems that I have some problems when I do - heartburn, indigestion, bloating and things tend to get a little blocked up for several days which causes stomach cramps.

I have always thought I had IBS, or that is what the GP said, but now I'm thinking this may have been the problem all along. When I don't eat it (I've even been using a whey-free margarine and soy milks / yogurts, etc.) I seem to not have these problems, so now I'm noticing the issues more, if that makes sense. I mean, I used to have these stomach problems all of the time and just had to deal with it, but now that I am avoiding dairy on some days, the issues come and go, and that's the only thing that has changed.
I don't really want to give up cheese and ice cream forever *gasp* so I'm just wondering what other people do? Is there something I can take to help me digest the dairy, if I do decide to have some? Should I just go back to the GP and mention this to get a test or something? (Not sure if they would bother with one, though, to be honest.) Shall I just avoid eating dairy as much as possible and just deal with the aftermath when I do cave in? Thanks for any advice!