Nicole,
I'm so sorry you have been having such as rough time, I can't imagine what it must have been like for yourself and your boyfriend to be attacked. Have you had any professional counselling following the attack? Are there any victim support agencies where you live?
I really won't fret about the appendectomy, I went through a very similar experience about 8 years ago. Day after my birthday I had a pain, thought it was from the excesses of celebrating my birthday (or trapped wind) and I thought I could walk it of

, that's when my wife knew there was something wrong, cause at the time I only walked as far as the car! I too ended up with a wound infection, it took a while to clear up but once the doctors discover it, they can treat it. The important thing is that you/your boyfriend didn't wait for the appendix to burst and now that it has been removed that can't ever happen.
I really think you need to do two things, first of all give yourself a break, you have been dealing with a lot of things and secondly I think if you can get some professional help for depression that you should really do it. Being depressed is nothing to be embarrassed about (I'm not saying you are embarrassed), it is an illness that needs to be treated they way you need to treat your diabetes.
I think you were right and brave to post here, you needed to vent, please keep posting and if you need to - venting. We are all here for you, I know there are people here far more qualified to help you but I wanted to let you know that you have my support.