[Closed] Stomach Cramps from eating red meat and protein shakes

I've been intolerant of red meat for the last couple of years now, anything bigger than a small ham sandwich will give me terrible stomach cramps, nausea and flatulence from both ends. It's so bad I ended up in A&A on a morphine drip one night after eating a steak. I also had a load of blood tests at the time, though I can't remember exactly what they were for.

Anyhow I clicked onto the fact red meat was the trigger and I've been fine since, providing I don't eat it. I never got down to the exact cause as once I'd found the trigger and they'd ruled out anything really major they lost interest in digging deeper.

I've never been too fussed as I've always preferred chicken/fish to red meat. But recently I've started going to the gym a lot more and started using whey protein shakes, which have started triggering the cramps again.

I'm booked into the docs next week but wondered if anyone else has anything similar? My first thoughts were either some protein or lactose intolerance. I've never liked milk other than a little in a cup of tea, but butter/cheese seems okay.