Why am i always feeling swollen / full ?

why am i always feeling full / swollen / bloated ??

even when am not eating am feeling full / swollen or bloated ??
i suffer with acid reflux and am trying to eat little and often as i had an eating disorder aswell so eating little and often is even a struggle for me so am trying my best to keep to little & often etc,, but when i eat even if its a piece of choclate, biscuit, toast etc... my upper abdomen right below my ribs feels swollen, full it don't hurt or anything but it can be hours after i have last eaten so i should be feeling hungry right ?? but am not :( the last thing i had was a yogurt probiotic drink and within minutes my stomach felt bloated feeling......... and then i get this frothy lump feeling in my throat.................. and sometimes can feel nausea its just i no i need to eat but i just dont feel like eating ?

this just kicks off my anxiety as i worry to much about it
the foods i mainly eat are junk - biscuits, toast, sandwichs, chocolate........