How to deal with anxiety after a breakup ?

Hi I’m 22F and it’s been a month since I walked away from my bf of two years. He joined the military and became emotionally unsafe and hurt me a lot with inconsistency and not being present or feeling safe anymore. I started getting panic attacks and had to leave him after being hurt again and again. Now it’s been a month of no contact and I’m still feeling very anxious even though I try not to check social media I keep ruminating and feeling shaky and oversleeping.