I have been where you are now. Past sexual abuse, traumatic births, PND and young children meant me and my husband weren't intimate for over 2 years. It was really tough on our relationship and I understand your distress. I really questioned why we have to have sex, if I ever wanted to again and if I should leave my husband. But fundamentally we love each other very much and we make a great partnership. I realised that I did want that part back in our relationship but I was so frightened, I found it so triggering. But we now do have an intimate relationship again and if you feel that you would like to too (and you don't have to have sex to be a complete person, for some people it just isn't necessary and that's ok) this is what helped us....
I had a LOT of therapy, going right back and dealing with past traumas. It was a very slow process and very painful but it helped me to feel safe again. Compassion based therapy and a therapist experienced in treating sexual trauma was really useful for me.
Communication - rather than being the elephant in the room me and my husband started talking more about sex and being intimate. I opened up about what had happened, how I was feeling and what support I needed and I listened to his frustrations. I was lucky that he was very patient and supportive, but he also needed to know that I was working hard to get that part of our lives back.
This bit I found the hardest, but learning to love myself and be intimate with myself was so important in being able to let someone else touch me again. Like you, I wasn't really interested at all, but I started by just getting used to being naked on my own, looking at myself naked in the mirror, taking time putting body lotion on and getting used to the feeling of touch. Buying nicer underwear (not necessarily sexy but stuff I felt nice in). You also change after children so what felt nice before might feel different now, so explore what feels good to you.
Make sure your husband knows that if you want to kiss/be intimate it might not lead to sex so it takes the pressure/panic off initially. We started cuddling more in bed and on the sofa. I made sure we kissed everyday. It was so slowly slowly. Then I felt better pleasuring him at first, to be in control then after time I let him touch me more until I was ready.
I was a long slow emotionally painful process, but it has made our relationship stronger than ever. I also posted on here a while ago about the same issue and found the replies quite hard to take (every marriage must have sex = I was a failure/bad person...). Be kind to yourself, you've been through a lot. Good luck x