...cranking my anxiety up: the thought of going into child custody mediation knowing she wants full custody.... I have always been a part of my kid's lives..
Been there. I just glanced at your states custody standards. Similar to mine.
My lawyer said "It is mine to lose"...IE I should get 50% unless I start messing up and not doing things. Hopefully the same in your case.
You have proof she is a liar (Phone records and her statement) use this as evidence she is also lying about your involvement.
If your goal is to have 50% keep taking steps toward that. I stayed in marital home until I had 50/50 written agreement. I moved into a rental that 3 bedrooms. one for me. On for D. On for the boys. I purchased bunkbed for the boys. I attended parenting classes.
Stand up for your rights as dad. It is worth it.
As for the anxiety, Your thoughts and fears are creating it. Learn to self-sooth. Breath. Take actions instead of thinking.
You can handle it
R2C "What is best for my kids is best for me"
PS: Research shows what is best for the kids is equal and frequent involvement with BOTH parent. Arm your self with this type of info.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712