How to deal with prison trauma?

I did 5 years from 18yo to 23yo. Never actually got diagnosed with PTSD but since i left prison i cant shake this paranoia from my head. I'm constantly on edge thinking people are scheming or plotting against me. Like i would have a causal conversation but my nerves would start firing and i would become hypervigilant. I would listen to every word and facial expression and if there was any hint that the person i'm speaking to means harm i label them as potential threat. It's like i have my guard up 24/7. This is destroying relationship with my family so far and many times when i was right to be warry it just wasnt worth confronting people as I would not trust them anyways if they told me I was wrong.