Back Pain

When I was 20-21 I was dating this guy that was very possessive and didn't like the way i was dressing. So because he started to scream at me ( like he was my dad ) I was ready to leave his house and from his life. When I touch the door know he throw me like a 15 0r 20 pound exercise weight and it hit my lower back. So now that I'm 32 it had reflect, my lower back be hurting 😫 every time. Have something similar had happened to any of you. ? Just wondering if is really from that incident or it just cause I'm alil over weight.