Hi
i was sectioned in my early twenties as I had a Manic episode.
He does sound manic to me, and it can be common after a period of stress (either physical or mental).
You must get him to see a medical professional as soon as possible as the longer he is untreated the more serious the problem came become.
i was incredibly delusional, I seriously considered burning down my parents house,(though I had a good relationship with them) but I thought I was defeating an evil force.
I wrote a lot of things, would skip conversation to conversation. Would read 'signs' in everything.
If he is out I would phone NHS direct and get their help. If he gets in anyway violent or aggressive you must get help immediately (999 if necessary). I was unbeliveably strong, it took 6 aides to hold me down and I am ususally a real wuss.
He may become paranoid and suspicious of you and everyone, don't take it personally.
I really hope that you are ok.
My parents had to trick me to get me to hospital and said it was the worst thing they have ever done. In retrospect it was the best. You will be doing him a big favour by getting him help. Though it may take him a while to realise it.
Just to reasure you, I was very ill, but now am completely well, and no one knows I was ill unless I choose to tell them.