Stomach issues

I was wondering if anybody else has a bad stomach like this - My issue is that I'm never hungry and when I do eat I am extremely full after 1-2 bites and it's extremely difficult to finish a meal. I get a lot of stomach pain and feel sick also, it is really upsetting. I also have ME/CFS so It could just be off that but I'm unsure it is.

I hope somebody has some advice they could share with me as I couldn't really find any advice on the internet. 

Have you had b12 level and thyroid checked?

Yeah I have had them both checked and are normal

My son has similar symptoms. He has low b12, do you know your thyroid results? Sometimes doctor tells us results are fine when they're not.

Unfortunately I dont think i do as my doctor has never gave me a copy of the results, i did see a immunologist aswell who also will have checked them I think