I can distinctly remember at one point my first week out walking down my hallway hunched over going "Dear Lord why did I do this!" It was a split second thought. The symptoms you are having are SO common. If you read others post, you are absolutely right on track. The good news? EVERYONE kept telling me hang in there, around day 6 or 7 you will turn the corner. And they were right.
Are you walking? Even if it is in your house round and a round, walk walk and walk somemore. It seems its the only thing to help, as well as gas-x. They make a strip you can take too. You can get through this point. Hoping you starting turning the corner soon! Hang in there!