The town that I live in has a deli/cafe that I enjoy eating at. I usually have the veggie sandwich which consists of whole wheat bread, lettuce, tomato, banana peppers, sliced black olives, onions, american and swiss cheese and mustard and mayo(I get mayo on the side). Any estimations of how many calories this would be?

Well it would depend on the size of the bread. A standard sized slice of bread would be around 120 calories. It would depend on how many olive slices and how thick/big the slices of cheese were along with how much mayo you add. Lettuce/tomato/banana peppers/onions all have calories but I'd try focusing on the more caloric items to estimate.