Wasn't sure where to post this but thought I'd get the best advice here. I've also namechanged from the name I usually use although I've posted under this one before.
So, an old old friend turns 40 in a couple of weeks (we've been friends since we were 11). She's not one of my closest friends, but we've done a lot together over the years and she's been there at difficult times and I'm very fond of her. She doesn't have kids or a partner (only relevant in that the dynamic has changed since I had mine).
Anyway, she's going to have a lunchtime party so families with kids can come along, in her flat. This is great, but I used to live in that flat, at a time when my then partner and now DH had split up. It was initially a very difficult time for me - I was very depressed, suicidal at times. I pulled through with the support of incredible friends (this friend being one of them) and an amazing GP and started to be very happy there. When DH and I got back together (he asked me to marry him and I moved back in to our home), part of me felt really sad that I was leaving the flat and if I'm honest part of me still does when DH and I argue and I think did I do the right thing by going back to him.
So my anxiety is that I really want to go to this party, and owe it to my friend, but I am absolutely terrified of going back to the flat. I'm scared of all the emotions it'll dredge up for me - the dark times but also the questions. It's hard for me to explain as it was a very strange part of my life that in some ways is thankfully gone but also comes back to haunt me at times. I don't want to say this to my friend as she's very happy there and I don't want her to feel that this is an issue on her birthday, so I need a way to be strong about going.
Hope this doesn't sound very self-indulgent and pitying. I guess I'm asking for advice in physically facing a recent past that has complex memories for me.