The shoulder pain is gas. I was lucky and had none, but my doc said to take chewable gas-X if it happened. Walk, walk, walk. It moves the gas around and out. Pardon my frankness, but The first few months I was a farting machine, especially once I had some food. Sip the shakes slowly and I promise the depression will pass too. It is normal. Hang in there. BUT, if you really feel something is off physically or mentally, call the doctor. They are there for YOU.