You said you haven’t been paying attention to your health, and you notice that taking a toll on your body. So change that. Whatever needs you’ve been neglecting, start fulfilling them. If your body needs more water more often, start trying to drink more water throughout the day. If you need more sleep, look in to natural sleep enhancers (like Valerian root) or ways to help you fall asleep (like lavender scented spray/oil). Eat more if you haven’t been eating as much.
Also please take care of your wounds. Do not neglect those, infections are not fun.
You went years without cutting. So you know there are alternatives that work for you. And you know you’re able to not hurt yourself and still be okay with whatever life is throwing at you. You just forgot.
Revisit coping mechanisms you used to use. If those don’t work, it’s time to explore new ones! Let someone know (if you can) what’s going on, so they can help distract you and/or remind you you don’t need to hurt yourself. If you feel like you can do it, throw out the tools you’ve been using, or ask someone to keep them hidden.
Something to always ask yourself is: Would I do this to my best friend’s body if they were feeling this way? To my partner’s body if they were feeling this way? To my child’s body if they were feeling this way? To my pet’s body if they were feeling this way?
If the answer is no (and I really hope it is), do everything in your power to try and not do it to your own body. If your loved ones were feeling low and hopeless and unwanted, would you handle that by hurting them?
You deserve the love and are you give to your loved ones. Remember that.