I'm due to get my surgery in 2 weeks and I'm struggling with dealing with everything

The reason I'm struggling so much is because of everything else I've got going on in my life surrounding this operation. Me and my boyfriend have just bought our first house together and moved in. This meant me moving out of my family home and to a new town which is stressful enough. I do feel a little bit homesick/lonely but I KNOW this will pass. However, the week we moved out my boyfriend's mum got diagnosed with terminal cancer and given months to live. Dealing with all this is extremely difficult.
I worry about what its going to be like after the operation as I'm pretty needy and, selfishly, as I've known I've needed this surgery for I while I thought its okay I'll get through it as I know my BF is my rock and he will be there 100% for me. Obviously I understand now that he can't be with me 100% (mostly emotionally) and I'm already struggling a bit as just the build up to it is draining.
So I guess I just wanted to vent a bit. I've read how difficult people find it after the op emotionally and physically and that depression can easily set in. Has anyone else had to go through the op as well as major other stuff in your life right at the same time??? How did you deal with it?? I can't postpone as he doesn't want me too, I've waited too long, I have a lot of symptoms from my bite that make me feel rubbish all the time and, morbidly, if we don't get the op out of the way now while she is still here with us then it could be much worse to have it later!!