I have been there! I am so sorry!
I hate to tell you that I lost weight (w gb problems) so fast, I was always on the brink of being hospitalized. Food became the enemy bc I feared that anything I ate could cause the pain that caused me to pray for death (bc it often did). I hope with your new diet, you never have to be there!
BUT I did make it 10 years without surgery bc I learned what I could safely eat. For me, all fats are not equal... I cannot have meat fat of any kind and nothing deep fried. No fake fats. No coffee. I can have limited (like you said around 5 grams) amounts of olive oil, avacodoes, other fruit fats (organic coconut oil), even very small amounts of butter (for me organic makes a difference).
Skinless chicken breast was a staple, and so was salmon and eggs. I could have nut fats like peanut butter and tahini, but not everyone can. I am focusing on protein here bc it is hard to get enough when you're restricted. (Also, if you start losing weight, protein becomes even more important so your muscles don't atrophy). How are you with dairy fat? Have you tried yogurt and part-skim cheeses? Hopefully you can have most fruits, veges and grains.
I know this is nothing like a menu, but maybe it can get you thinking on how to alter what you already like to eat. You can PM me for more specifics if you like.
Oh-- and for immediate pain relief for an acute attack add 1-2 T apple cider to one cup unfiltered apple juice. If this doesn't help in 30 min, call a doctor.
Hang in there.
blessings-- hope you escape any further gb trouble!