Hi @Naenae, and welcome to the Sane forums. @CherryBomb has tagged me here because I have a partner who has PTSD. But I also suffer from PTSD myself. So I guess I can give some insight from both angles, as a partner and as a fellow sufferer.
You didnt say in your post whether he has been formally diagnosed with either PTSD or bipolar, although you mentioned both.
Firstly I will say that it is definitely not unusual for PTSD to still be this intense 10 years after a traumatic event. In fact some people do not even experience any symptoms until years after the initial trauma. For me, I had intense symptoms for a couple of years, then had periods of maybe a year or two where I was relatively 'normal'. Its now 21 years after for me. However I never sought any treatment until almost 3 years ago, and was only officially diagnosed at that point.
It is believed that the most important thing post-trauma is support and understanding from those around you. Being able to talk about it. Often this is enough to actually prevent PTSD from developing.
When we are triggered and ptsd returns with a vengeance, we can become very angry as we do not know how to handle the extreme symptoms of anxiety that occurs at that time. Most of us also have periods of intense depressive episodes. Triggers are often obscure and may not seem to be related to the original trauma, and yet our brain is convinced that there is indeed a link.
Okay so he has taken off. Give him some time, he may well feel as though he is actually protecting you from him. Let him know you are there for him when he is ready, that you want him back. When he is able, he will come. Sometimes what we need is a bit of time to get ourselves straightened out. Does he ever discuss this horrific accident he was in? Perhaps there have been some horrible car accidents he has seen on the news lately, that would be enough to trigger him most likely.
When he does return Naenae, try to urge him to see his GP and get a referral to a psychologist who will be able to help him. Offer to go with him if he would like you to. Make sure he knows you are there for him and that you support him, no matter what.
Yes its very hard living with someone with PTSD. But it can be treated and he can recover to the extend that life is worth living again. With appropriate treatment it does get easier, for both of you.
Good luck, and keep in touch. Sending you a comforting hug, you poor thing.
Sherry xx 