I was 12 days over with ds 1 when labour kicked off. 14 days by the time he was born. Sounds very much like your 1st childbirth experience. Long, back to back, epidural, forceps. I really struggled afterwards and felt very guilty and traumatised.
I gave birth to ds2 on Sunday and can honestly, hand on heart, say I enjoyed it and feel a deep sense of happiness every time I think about the whole experience. It was much easier and shorter but moreover I was better prepared. I had a wonderful doula who helped us through the whole process. We found her on the doula uk website. I don't know if you considered it an option. She helped talk through our fears and hopes in preparation for the birth as well as bing a supportive voice and help during the birth. She is also a masseuse which was incredible during labour.
One thing she did was help me address any fears and minimise them. So when I started to go overdue I was worried about induction. My doctor had been pushing an induction conversation at 38 weeks! ds2 was 9 days she helped me prep for my midwife appointments to delay conversations about induction until necessary. Having done this I shared with my midwife that talking about induction would make me anxious and could I delay it just till my next sweep. The midwife was really receptive and I went into labour before the next sweep.
My point (sorry I am taking ages to get there) is that with this help I was able to put things in perspective and be my own advocate. Last time I felt like I was jut going through hospital protocol and had no one to really explain my options.
In the end labour was much shorter. By the time I got to hospital, having laboured at home, I was 10cm. With my lovely dh and doula I felt good at home. I rested, ate, walked between contractions. Had a change of scene eg, bath, birth ball, birthing affirmations download to help my mindset. Labour was still full of surprises. The hosprial was really busy on my arrival and I ended up giving birth in the assessment room. I was so happy to be fully dilated and excited to meet our baby that I didn't really care that any water birth or privacy come to that had gone out the window!
I think trying to focus on the things you can do to help yourself and accept those things you can't is the big thing I have learnt and would say to focus on. It will be a different birth and labour so focus on the excitement of that. Pm me if you want any advice on finding a doula. Good luck.