Hello Friend, Good that you are seeking a help. Any relationship failures will take time to settle and you are in that transition stage. It's obvious, such emotional disturbance will  trouble your body functioning and causes  sleeplessness , nervousness, digestion, palpitations, panic attack etc. Best thing you should do is accept it at your mind and figure the way to divert your attention and thought. Yes, it's easier said than done. You may take some counselling support to guide you through this process..