IBS/Hiatus Hernia

Is there anyone with advice ? LIFE has slowly become more difficult to eat and what is safe to eat . I am very sensertive/allergies to a lot . Some things make the acid severe burning my stomach , chest and throat to the point I get food causing spasms trying to get to my stomach . Then many things give me IBS constipation . Constipation has always been a problem anyway since a child , IBS makes it worse . I try to help but when first eating or taking meds , it either makes me bad straight away or it seems ok but by day 3/4 I'm in pain with IBS. E.g. I just tried probotics and fruit juice with my rice crispes , the juice gave bad acid and thought was the IBS so stopped it, I got to day 8 with the probiotic yoghurt drink and the pain in my stomach was awful , it made me go to the toilet each day but the stimulation aggravated it and gave IBS and I have got two huge lumps come on my lower stomach since taking it . I eat the same each day , rice crispies , boiled/jacket potatoes , carrots or a tiny bit broccoli , chicken . Some times rice pudding low fat or some dairy milk choc . I only drink semi milk and a lot of water . I take 300mg twice a day of Rinitidine for acid ( allergy to omoprazole and that group ) . I had a big stroke nearly 4 yrs ago and that's when things went even worse , an odd anti_biotic could be taken but after all they gave me close together ( the stroke gave encephalitis too) Every anti biotic gives chest pain and severe IBS . I'm still hurting from the probiotic and will have to take Mebeverine , that's ok , and not eat for 48 hours . I'm really at a loss what to do next having tried a lot and so fed up . The stroke also gave me epilepsy but the meds make me very ill and so they said not to use any but it means a seizure can just happen any time . I'm also allergy to husks so can't have fibres and movicol gave a blockage as I've a slow , mega , with an extra loop bowel . Please let me know any thoughts . Thank you for reading it .