Yes. BTDT. You are not alone at all in hating anniversaries.
We recently had our 40th. WW hosted a big party at our house. Lots of people there. It was very hard for me. I kept to the edges of the party and ran the bbq and drank beer with the men.
I feel our M ended when she jumped into bed with OM.
After Dday I asked her to plan a vow renewal ceremony. She said she would but it never happened. I guess I was not worth it.