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JennJenn I think the recommendations vary drastically from person to person. For me personally, when I have a flashback triggered by something my boyfriend did, I want nothing more than for him to hold me very tight and tell me, sometimes repeatedly, that he loves me and that everything will be OK. For some people with PTSD, hugging tight could be a trigger!
I recommend asking him what he thinks you should try. Make sure to ask him when he is NOT in a flashback. While in a flashback, it can sometimes be impossible for us to think about and verbalize how we feel and what we need (at least for me it is). Personally, I am usually unable to speak during a flashback. Ask him what would help him feel better, or just what could lessen the pain in those moments. I know that sometimes (or so the stereotype says) it can be more difficult for men to verbalize their emotions than women. If this is the case with your boyfriend (or husband, etc), try watching what things make it worse while he's in a flashback. Gently try something new, something that is supportive to his present situation and shows your love. Perhaps saying "It's ok, I love you, it's not your fault, it will be over soon." Or, rub his back or turn on his favorite music. Try to focus his attention on what is happening in reality in his present moment, as this may help him realize that his flashback is not real. Try soothing things. Be prepared to back off if he doesn't like it, and try not to take it personally. Remember, even if he is directing his frustrations or emotional pain towards you, you didn't do anything to purposely hurt him. It is not your fault. However, if you're committed to him, it's your role to support.
I'm mostly giving recommendations based on my own personal experience with PTSD (with emotional flashbacks, which are quite different from other kinds like visual flashbacks). So, if someone else has more suggestions please list them. I'm sure my recommendations are limited to my understanding of my own PTSD, so they surely aren't sufficient. I think suggestions from others on helping "ground" him might be handy...I'm lacking in knowledge on this.
Also, I really commend your efforts to seek advice on this forum to support your loved one. What an expression of love!!!