I need help with my....?

Oh dear. When you have a large chest you cannot buy just any dress you like. Unfortunately you've learned this the hard way. When girls with big chests shop for clothes, they ALWAYS have to keep their undergarments in mind. Some cuts of clothes you will never be able to wear because there simply is no bra that will accommodate you and also go with the cut of the clothing. Does this dress have thick straps or spaghetti straps (you shouldn't be in spaghetti straps anyway with a DD, no support and no hidding a bra strap). Unfortunately adhesive bras will not work for you. Your are large and too heavy and you will get no support or lift from them. Your best option might be a strapless corset. Bring your dress to a bra fitter (like at Macys) and see what they have to say/offer as a solution. Good luck.