Having IBS complicates things........... I've been battling IBS-D for most of my life - but the past 7 years have been a nightmare. I switched to Primal a little over 2 years ago. The first 6 months I was spot on strict without a single cheat, except for alcohol. The diarrhea problem never got better.
High fat will definitely make IBS-D worse. And you can most certainly eat a low fat content and still be primal. Go for lean cuts of meat - eat chicken breasts instead of the darker fatter parts. Go easy on the added fats when cooking or adding salad dressings. I've finally found a love for Balsamic dressing
Try adding fermented foods. Do you take digestive enzymes? A good broad spectrum digestive enzyme is important when dealing with IBS since digesting seems to be the main problem. Also - a good probiotic.
I'm no expert and don't have the answers........ but I've been getting loads of GREAT advice from others on this forum who have dealt with digestive troubles. I read a LOT - always searching for a new approach. Currently I am focusing on eating 100% primal with the low fat meats and easy on the butter/oils/fats.
As for the veggies kicking your butt........... try to eat them well cooked - and even pureed for a bit (see the Specific Carbohydrate Diet for more info on that)
Good luck............ come by my journal and we can try to work on this together if you'd like!
1. Love ME no matter what noises are screaming at me, or who is trying to tear me down.
2. Eat to heal
3. Move to live
4. Embrace today
5. Live with intention
6. Respect my body
7. Cultivate joy
8. Find my passion
9. Meditate on peace in my soul