Struggling to find the strength

Feeling really hopeless today. After completing detox last month and getting the sublicade shot I still relapsed. Today I start day one over again. Finding things to occupy me so I keep my mind off using seems to be difficult. Tomorrow is my daughters birthday (still fighting to get my kids back) and I wanna show up sober but I’m worried I won’t. I wanna stay clean for myself and my kids but seeing them and having to leave kills me. When I leave them I want to use and can’t seem to find something to ease the pain instead of using.