I know this sounds a bit like a voice from thousands of miles away but ... don't worry.
I had almost the same as you, but no epidural - I just had the episiotomy and mid cavity forceps with no anaesthetic at all, because there wasn't time.
I didn't have retained placenta etc, but I did have the third degree tear. I couldn't walk for more than two weeks. I had to crawl up the stairs when I got home. Everything was gone. No muscles. Couldn't run for six months.
I had immediate post partum shock - I had an incident where couldn't move for fear for half an hour. Then had severe PTSD. Mine wasn't properly diagnosed until much later, not least because I was too afraid to go to the doctor as totally traumatised by medical environments. I would try to walk over the threshold into the doctors but my body wouldn't let me go in. 45 mins one time trying. Every time my foot went over the line, full on panic response.
I couldn't walk more than about 4/5 paces without being gripped by fear I was about to die. Couldn't be in a car going over 30. Couldn't listen to news as any mention of fragility of life set it off. Couldn't watch a good film or funny tv or listen to music or read a good book as any moment of 'nice' experience gave me a rush of terror. Had to stick to very low key, reassuring domestic things like Ready Steady Cook. That lasted about a year and three quarters, probably as had no medical support and DH hadn't got a clue how to cope.
It was pretty bad.
And, yes, my second thought in the moments after the delivery were, like yours, an awful misery that I wouldn't be able to have another baby, because I couldn't risk my life like that again.
BUT (and this is a big but!) ... within 2.5/3 years, I started to be able to contemplate babies again. My drive was so strong to have another that my fear lessened over time. My DH and I had separated when our son was 2, and as it turned out I then had a long time waiting for the next baby due to not finding the right next partner. But when I did get pregnant (11 years after the first), I was of course newly terrified. But grimly determined! I had counselling and extra checks and scans from my GP and hospital in new area. We even got my birth notes from the first delivery and went through them, which dispelled some misconceptions for me and really helped.
I swam almost every day when pregnant, to be strong and unafraid, and made a point of bonding totally with my daughter while she was still inside. And I researched how women give birth in primitive situations with no medical care. Then I went into the birth not alone, but as a team with my daughter. No interventions or 'painkillers'. Walked through contractions. Gave birth standing up. Apgar scores 10/10 both readings.
Felt like a different person. My faith in Nature and the strength and amazing power of my body was restored.
You will be fine. You will get through this and get there. Quick diagnosis is fantastic, so you can get the support and enjoy your baby now.
Don't worry, I promise you. You WILL bounce back and have more babies. Just give it time.