You're right that you can come here to talk to people who understand.
I'm not surprised that you want some time off from all the surgery and I'm sorry that you're feeling so bad about things at the moment. I HATE my mastectomy but have come to tolerate it for now while I wait for a recon. I've tried to hide how I really feel from people but I think they've now come to realise. I think your feelings about it will lessen in time but it's obviously very raw at the moment. I've met people who have got used to being flat and have chosen to stick with it rather than further surgery. And I think maybe being balanced/symmetrical will help. For me, being - as you say - wonky doesn't help and I don't find the prosthesis comfortable.
Don't feel bad about the way you feel about your own circumstance. Yes, you're still here but you've had a really hard time and the fact that your friends friend has died and you're still here doesn't lessen what you've been through.
Sending you my best wishes.