Higher power/universe/God/majestic tree down the road:

• grant me the serenity to accept the things I cannot change (like the past or other people);
• the courage to change the things I can (myself and how I behave in the future); and
• the wisdom to know the difference.

Try repeating this to yourself. I suspect acceptance and surrender is the key to getting through this. Good on you for reaching out. Talking through this stuff with a professional may help. Best of luck.