This,
Yes, I too have your situation. I was hurtful in my past to a few people and obsess over it constantly. Panic attacks are the worst. My therapist believes while he understands my guilt, believes allot of the not letting go is OCD/obsessive though related. I can go weeks, and months and not think or obsess, then BAM like a brick to the head I get into a loop over it. You are taking the right steps by seeking therapy. You seem young so I would not worry much about it.