That sounds really difficult and kudos to you for pushing through and coming clean. It is amazing how the body can hold onto all this trauma and how the pain comes through physically. Hope you can get some sleep tonight and forgive yourself.
You are becoming the best version of yourself-- honest, forthcoming, compassionate-- and as hard as that was to open up about a lie you've been holding onto for so many years, I'm sure it was really helpful for her to finally understand what happened. You gave her the gift of honesty and as difficult as that was for her to hear it sounds like she appreciates it and the new you that was willing to get through the pain and fear to be honest about it with her. Good for you.
Me (46) H (42) M:14 T:18, D9 & D11 4/19 - 12/19: series of escalating BDs 9/20 - present: R and piecing