SERIOUS PROBLEM! Anybody else have this problem when they go into maintenance mode?

I've been eating a 1,000 calorie deficit for 454 days straight. I finally reached my goal weight a few days ago and lost 178 pounds. WOO-HOO! But, the bad news... Now I'm trying to eat my recommended calories now which is 2480/day and my food just sits there for half a day (sometimes longer) and doesn't digest and I can sometimes feel the buldge in my esophagus under my chest bone. It feels like a big ball of food and hurts really bad. The only thing I can think of is maybe after 454 days of calorie restriction, my body is used to only making a certain amount of stomach acid and can't handle the extra load. Just my theory... Please, any advice will help on how to fix this! Thanks!