I had surgery on the 14th and have had similar feelings. I went for my week check up today and he said that the tight chest feeling is from the "troll car" used in surgery being so close to the cartilage of your sternum (if you have the same type of inscisons as I do, I have one right in the middle right under by ribs in the sternal region). I guess being so close to all the cartilage and all the manuvering they have to do durning surgery really anoys that area. Said it should go away in a week, but should get alot better before then. I'm guessing if your port is up there, might make it a little worse. As for dizzy spells, I get those too, did before surgery as well. I think its a dehydration thing, if I drink enough water i don't feel it, but I can tell when I haven't been drinking enough it creeps in. Oh and I've also heard that if you had a hiatal hernia repaired at the same time that its normal for a tight chested sensation as well for awhile.