OP I had many similarities with my first birth - dd was 9lb 3oz, long 32 hour labour, ventouse, PPH... felt totally 'in shock' afterwards, and really felt that the process in hospital had been 'brutal' (kept repeating that word over and over through my tears while I was in hospital). I felt very anxious about even returning to the same town that the hospital was in, such was the extent of my fear... but like others on hear say, it does fade in time.
I had a 'talkback' appointment when dd was 6 months, and that was upsetting (seeing the notes again, seeing the hospital again, talking through the events etc) but I felt better after it. I suppose the biggest thing that helped me was talking to other mums and realising that, without wishing to detract from your experience, other people experience similarly traumatic feelings about birth, and I suppose when it is your first you just don't know what to expect at all.
I went on to have ds, and despite being anxious had a natural birth, then had second dd two years ago, and had a completely different type of labour - very quick!! I'm now waiting to be induced with my fourth this Sunday, and am very anxious because I haven't been induced before, so in some respects the anxieties etc don't go away, but you will, in my experience, never feel as bad as you did first time around because then everything was so unexpected, so confusing, no points of reference at all.
Take your time - it is very early days, and you are bound to feel so emotional and its all so raw. Be kind to yourself. People used to say to me, 'ah, but its all worth it' but tbh I felt I shouldn't have had to go through what I'd been through, and it made me feel worse to hear people sort of telling me that I had a healthy baby and should just get on with it. Talk to people who listen and understand, and think about what support you might need to do it again. I was 31 when I had dd1 so felt time was ticking, but 5 years later am now on the verge of #4 so you have plenty of time! Good luck and congratulations!