Good morning, I am Dr Ruff. Thank you for contacting us today.
I am very sorry to hear about what you and your son have experienced, I can only imagine how hard this has been for you both.
As your son is 38, the main option for him is Psychotherapy, this can range from CBT to eye desensitization therapy if he has experienced trauma and may have a degree of PTSD. Medication is also certainly an option but I would suggest only in combination with psychotherapy.
This is something you can refer to directly without having to ask your GP for a referral, or alternatively you can contact someone privately to discuss your sons needs.
Please use the following link to access what providers are available for the GP practice your son is registered to.
Please do let me know if there is anything else or if you would like to discuss this in more detail.
I hope this is of some help for you both.