What are the possible risks and complications that can occur after I get the peg tube because my dad is extremely worried?

You need to discuss You need to discuss with your physician. you need to discuss this with your physician. We do not know why you need the peg, and thus we do not know the rest of your health problems. The peg is there to help give you nutrition when you can't take it yourself. Your physician can discuss the risks and benefits related directly to you as we can without knowing your health and your case.