I became slightly delusional when I went to India. It was after my third reiki session when I staying in Dharamkot near Mcleodganj. I went up, then down. I suddenly understood the cause of all the worlds problems and thought I could save the world by drawing a fucked up picture and emailing it to all my friends back home. I sort of retracted into my own world and didn't actually want to come out of it. For the first time in my life I felt more free than I ever had, and I liked it. That reiki stuff can really fuck with your head, I recommend trying it, maybe it will help you understand yourself, only you can do that.
I had something similar to this after a hard breakup and a lot of other bad things that happened in my life at once....I shut myself from the world and every living soul basically, and it felt like a nightmare which the only way to wake up from is by dieing.. of course those are the real reasons why I had that phase, but at the time I didn't realize that and thought the world was a hopeless place to live in and whats the point of struggling in it ? That lasted a little less than a year, and to this day I hope it never happens again.
I could function at first, but as time went by it became physical too, tired all the time , long hours of sleep, little if any communication with the people who surround me ..etc.
its tough to respond because I'm not sure what you're talking about. Maybe post a few more specifics about what you're feeling and the things that you think might be causing it? I'm sure most people here will have gone through something similar, or are good hearted enough to want to try to help even if they haven't. But its tough with the vague stuff you've given us.