There are a lot of treatments for PTSD. I've done traditional psychotherapy that was trauma-focused and it has helped me. Art therapy has helped me, mostly to process traumatic memories. Personally I found the art therapy more helpful. Also there's something newish called Eye Movement Desensitization and Reprocessing (EMDR). I did a few sessions of it and it seemed helpful. My therapist's contract expired so I had to stop before I got the full course of treatment. Here's article on EMDR:
EMDR Therapy for Trauma and PTSD: Benefits, Side Effects, and More
My grandfather also had PTSD and hypnosis helped him though I've never tried it myself. Also, there are medications available to help certain symptoms of PTSD such as anxiety, depression and nightmares. Anti-anxiety medication has helped me. Antidepressants didn't agree with me but everyone is different. I've never taken anything for nightmares and now that I've been through enough other therapy I can happily say I no longer get nightmares very often. There is hope for PTSD. Progress can be slow but progress is progress.