Jo,
I felt the same exact way after my surgery...I had my ileostomy surgery and was in the hospital for 6 days, then I went home, but 2 days after being home I had to go *back* to the hospital because I had an obstruction... got an NG tube (*horrible*), etc....trust me, you sound a lot more upbeat than I was when in the hospital...!
It is so hard to get yourself going when you really do not feel well. I had this one nurse (I called her "the drill sergeant" in my head) who would come in each day and and pretty much *make* me get up and go on walks, get up and get a shower, etc...at the time, she kind of got on my nerves, but I realized that she was doing me a favor, and I thanked her for it!
When you said "one minute I am fine and the next minute I am crying," --that was Exactly what I did!! :) When they were going to order me my very first meal after not eating for almost 14 days, I was so excited and anticipating it all day! I was supposed to have a cheeseburger, sherbet and iced tea, but when the girl delivered my meal, all I got was a dry, cold English muffin with some margerine! And I actually started to Cry! (I was so embarrassed, I tried to hide it, though..).
anyway, I know each day you will feel a little bit better...! I hope today is your best yet!