Ex boyfriend

So my boyfriend, now ex, broke up with me 2 months ago and my closest friends besides him think I should be over him by now but I'm not and I'm not sure what to do. I'm miserable and whenever I've tried to set up a plan for a rebound I always end up having a panic attack and going back to my ex for him to calm me down. I really dont know what to do since I havent been able to move on and whenever I'm distracted my mind somehow gets back to him only causing me to be even more upset than before. Any advice?, I really need it