I just thought of something regarding the chest pain you were describing. I used to have severe Benign Paroxysmal Positional Vertigo and it basically made me feel seasick or like a bad drunk when you get the bedspins... all the time. I was constantly nauseous and sometimes turning my head too quickly or in the wrong direction or seeing too much motion would make me throw up. So, I went through a couple of years where I was throwing up at least a few times a week. I used to get pain in my chest from pulled muscles and muscle spasms. That could be what you were experiencing. There's also the burning pain of acid in the esophagus... You can feel that in your chest too, like very bad heartburn. I also used to get strained muscles in my diaphragm that were very painful. It tended to be much worse when I was throwing up at times when I had eaten little or nothing.

Take care.