I am sorry to hear that. I am not familiar with the interaction of herpes and being diabetic so I am unable to help offer advice there. I just know that in general with just this virus you have to not let it take control of you. You have to remember that you are the same person as before.
I am not sure where much of your sadness is coming from but, can you talk to your boyfriend about this? is he supportive? I know that talking about it can help tons!
You could also use this board as a venting center if you need to