I'm so sorry about your experience and your feelings are completely valid.
I had awful damage, I also have a rectocele, near non existent perineum and torn uretha.
The mental and physical trauma has been horrific. I still battle daily with my mental health nearly 4 years on, but I got great physical care.
Women's health physio was absolutely life changing. I credit that woman to keeping me continent and having confidence to poop normally. I use something called a qufora to support if I get too much pressure. I also use suppositories if I feel a bit constipated and take my time with feet on a stool.
Do your pelvic floors, alrhough until I saw womens health physio I actually hadn't done them well/effectively. My physio got me to pay for the NHS squeezy app which is good.
Ask for a referral to the physio, even if not available locally. Refer to surgeons too, as surgery was an option for me too. Get your mum to do some of that fighting for you if needed as it is so exhausting.
Speak to your husband and be honest you might need some trauma counselling and referral to mental health services which your GP can do. You can self refer to IAPT (Google it)
It's a tough journey, one I'm still struggling with, but I feel better in my physical health, sex took a long time to get back to, I was scared and grateful my husband was patient. Took a few attempts to feel a bit better.
Sending you lots of love