Feeling very nauseous after my one meal

Hi all,

I started IF a few months ago and slowly closed my eating window until I got to OMAD which was exactly one week ago. I have digestive issues, IBS, and a few allergies. So no gluten, fructose, or alcohol sugars plus a few veggies I can’t have either. It’s very difficult for me to eat to begin with.

Since I’ve gotten to OMAD, I find that I feel really sick after I eat. I can’t get 1000+ calories in for my one meal. I tried opening the window back up, having a snack at 4/5 and then dinner before 7. Instead I just feel sick twice a day instead of once.

Have any of you experienced this? Does this mean that OMAD is not a feasible lifestyle for me? I’m not sure what to do- it doesn’t matter if it’s rice and grilled chicken or sausage and peppers or salad - I feel sick to my stomach for at least an hour after I eat. What can I do? Thanks in advance for your help.