I am currently just under 8 stone in weight but I cant maintain or gain any weight at all. I have several health conditions which cause me chronic pain and make me lose my appetite and I cant eat some days due to this. Is there anything I can do to try gain weight or any supplements I can take to help me with my weight gain as some days I don't have the appetite for any food at all, due to my disabilities and suffering intense pain in my stomach? It stresses me and makes me feel low. Hope you can help me.