Bun my love what an experience you poor honey...
I do know posterior labours are hellish - my DD1 was posterior & all labours after that have seemd heaavenly!

I hope you recover well... In case you are interested.
I have a remedy for healing a peri -
comfrey, calendula & chammomile...
Wrap equal parts in muslin (good hand fulls) and steep them in a really hot bath.
Add celtic sea salt as well..

It really does help to heal more quickly. Also adding fresh aloe vera plant onto your pad against the area...

Thinking of you darling