Hello I share your concern. Full bowel and bladder may cause problem in erection especially in maintaining erection,as full bowel exerts pressure on the genital organ. For good erection you should be in well comfortable position, bladder empty and regular bowel movement . I would advise you to take antiacidity medicine like pantoprazole or ranitidine group of drugs with antacids for 4-5days. Burping might be related to number of conditions like Aerophagia ( swallowing of air), smoking, use of carbonated drinks and ill fitting denture or indigestion. Try to find out any of offending factor and avoid it. You should avoid overeating, have lots of fresh fruits and vegetables in your diet. try to avoid Fatty fried spicy and junk food and carbonated beverages. Hope this answers your question please feel free to ask for follow up question I will gladly answer you. Best wishes