I am so sorry of your struggles. I have heard that too about monkeys but dont know about it first hand. Have you looked or googled online? Would this be to help you be able to get out? I wonder now thinking about it why you dont see monkeys out like service dogs for ex? Would you think of getting a dog possibly or would it be too hard to take him out? I was not sure if you may have a sliding door or something?
Though I get out I also live alone and because of my medical and pain I am limited so have limited contact with people since my family is out of state so I also feel lonely. I did go through a period when I had severe ocd/anxiety/depression where I had not to the extent of what yours sounds like but a hard time leaving do to many factors. That though after over a decade of struggles and many treatments is better so I guess my point is that I hope things for you can too.
If you find out about the monkey let me know or if I read of anything I will let you