My advice right now is to focus on you and what you need to recover, everything else will fall into place once you have had a chance to recover yourself. Have you been to see your GP for you? To be honest it was one of the CPNs from DHs team who initially picked up on my PTSD, and then my councellor, I'm not convinced my GP would have done. I'm not saying that definately what you are feeling is PTSD, just that it's possible as police detentions and the surroundind events generally are incrdibly traumatic for all concerned.
PTSD often caused by a situation where you think that you or a loved one might die. It's caused by the fight or flight part of your brain going into overdrive which stops you from being able to process the traumatic memories properly and results in them resurfacing as nightmares or flashbacks. DHs last psychotic episode scared my to the point that I thought that there was a chance he would kill me. He's never been threatening towards me before, so it was a complete shock. For me the PTSD presented as anxiety and pannic attacks, flashbacks (but not that visual ones which I'd imagined PTSD to be, more that I would suddenly be hit by the emotions again without warning), inability to think about the event in any detail, (I could give a detatched factual bullet pointed account of the main events, but later realised that I had huge gaps in my memory), problems with concentration and memory (I went into work one morning and couldn't remember how to use a computer sysytem I've used for years, I even got stuck in our kitchen because I couldn't work out how to get out, and I couldn't work out how to do simple tasks like make a cup of tea. Another element is emotional numbing, where in order to protect you from the difficult emotions your brain turns down the intensity of all emotions. This is often misdiagnosed as depression. PTSD doesn't respond well to antidepressants though (though they are worth a try and did help take the edge off my anxiety) and talking therapy can make it worse (as I discivered to my detriment when I saw the psychologist at work) as talking about the events can retraumatise you. If if is PTSD that you think is affecting you then push to see a trauma specialist as it is completely treatable.
Did your DH suffer with psychosis when he was manic? It sounds like he may have done from your description of delusions and is not uncommon in bipolar. I'm not familiar with the NICE guidelines for bipolar, but the NICE guidelines for psychosis and schizophrenia definately reccomend support for the whole family, not just the person who is unwell (though I'm aware this support tends to vary by area and I've been incredibly lucky in this respect) Another thing is the Care Act which is a relatively new piece of legislation, which I have a feeling requires the mental health team by law to put in place an action plan for how they will support your husband with maintaing his "meaningful relationships" which I would take to mean his relationships with his parents, you and the kids. Because this is a new piece of legislation it is still filtering down to the front line professionals and it might need you to wave it under their noses and demand that they take notice. There should be a written care plan of how they will help your husband address this need. Ask if he has had a full Care Act assessment. I've got an article on it somewhere I will have a look for it after work.
If it's any comfort seperating when we did was probably the best thing that could have happened to our relationship. DH has been ill to some extent for years and I had gradually without realising also been absorbed by the illness. Having some time appart allowed my to build my own resiliance again and also for us both to figure out what we wanted from our relationship and come at it with fresh heads and also with my husband being in a better place than he'd been in for years. I had certain criteria that I needed to be met before we got back together too.