Well while minor, you have had a small surgical procedure, so some discomfort for a day or two should not be unexpected after a PEG placement. If it doesn't tone down by then please talk to your doctors. As to the cough and the heavy breathing, (chest congestion?) your body is under a lot of stressors. It would not be unusual to catch a cold, or the flu easily, or to have some kind of -not related to the PEG-, opportunistic infection. As before, you need to keep your docs in the loop if this persists after a few days on the antibiotics.