>>33210560 (OP)Try to keep in mind how toxic the relationship was and know that ultimately, breaking up was for the best. Get rid of shit that reminds you of him, but don't throw anything away yet. Just put it in your attic or basement or something so you can deal with it when you're less emotionally volatile.
If you have any good friends you might want to consider spending some time with them so you're not alone with your thoughts. Otherwise, do something for yourself. Eat your favorite comfort, watch your favorite movie, go outside on a hike and be in nature. Just do something to relax and unwind while you process everything.
Like any other loss, you'll have to go through the stages of grief, but know that this too shall pass. You will get over this. Don't try to rush recovery. Take it slow, be honest with yourself, and let it happen naturally.