What diet can i eat which will digest more easily, since hard to digest foods causes afib? is there medicine for this?

Atrial fibrillation: I know of know foods except stimulants that agravate atrial fibrillation. Ie caffein. There are many medications to help control atrial fibrillation. Note atrial fibrillation has a very real risk of stroke. Need to discuss diagnosis and treatment strategy with you doctor and cardiology. Atrial fibrillation can occur spontaneously but also can have underling cause that needs treatment.

Enzymes: You can try digestive enzymes, or betaine hcl. If you try betaine, take it after the middle of the meal, not with the first bite.