Can I commit myself to a mental health facility?

I am at my wits end, trying to work find a place to live and be happy without trying to intrude on anyone else'ss space. In the past I most dealt with mental health issues with illegal drugs and alcohol, but I just don't have the time or money to do that any longer. I have had previous suicide attempts and have sustained long term damage to lungs kidneys, stomache and liver, not to mention scoliosis and now what diabetese, I was suppose to go and have myself checked out at a community clinic, but I work everyday except saturdays; and usually sleep in on that day. I don'tt have a vehicle even if i did I cannot afford the mandatory insurance or vehicle maintence. For some reason I am considered unemployable, but when applying for ssi or ssdi I am continually denied. I guess the days I see statepsychiatristychiatriast I am high functioning, but they realize the 9month or so of sleeping for 20hours a day. In the past my weight has gone out of control with use of lithim (my heaviest being 340 lbs) which alone should have been enough for ssi being morbidly obese is a disease also in itself. I am currently at 199 which is still morbidly obese for someone having a 5'9'' frame.but with the manic episodes and an over abundance of completely unmediated/unmedicated 4 hours of sleep is plenty. The problem with that is the racing thoughts , the arrogance and just being out and wanting to do everything and be friends with everyone , the inability to concentrate and always being full of ideas .. well its just so hard to explain it all in a few characters here. Sure I could try to explain it to a psychiatrist but then they would have reason to commiwouldn'td I wouldnt have any type of control on anything. Its just all so confusing , I am afraid to go out in public alone I get to the point of what feels like having a heart attack if I am in crowds too long. I actually miss being in prison someDon'tbut Idon'tt want to break any laws to go back in. I want to be a responsible/respectable part of my community but also just want to shut out the whole world and be left alone.. which is not healthy. I do have a plan to take the easy wDon'tbut Idon'tt want to go to hell, and sometimes even think Jesus is calling me home I have served my purpose here on earth and now it is time to move on..but I cant be sure of what it isexactlyy He wants me to do. Im not sure of anything anymore and I shouldn't be the way I am or entertain the thoughts of finally putting an end to this battle I have been fighting for over 30 years now. I understand there are peopleallott worse off than me, but I am just tired of trying so hard and getting further behind everywhere I turn.