@Bingo Sounds great!
It varies agency to agency (and depending on how populated your area is, you might find a few). The one I went to, after filling out a paper to tell what my skills were, they then tested me on them (on the computer, since they were all office related skills, not sure what they do for people specializing in labor). Using the data from the tests, they placed me in appropriate work environments. But, another temp agency may work another way. I know my current roommate got placed in a call center when she joined one many years ago. It wasn't something she loved, but it made money, and she worked in the area where people are calling in, not where she had to solicit calling out.
Ack, yeah, I hear you. I used the computer wrong for so many years I developed tennis elbow. Had to live with it for a number of years before I finally made enough money to get proper physical therapy. I'm also thankful that my current boss is concerned about my well being enough that he pays for half of special things I need (like certain kinds of mice, chairs, etc), though in a temp environment, you'll have to work with what you have. If you go to the agency and tell them your limitations, they may be able to recommend certain kinds of jobs for you based on that, it's what they specialize in after all. And it hurt my pride to do it, but helped when I wasn't making a lot, have you considered applying for government assistance? Even the food program really helped when I needed it and wasn't making a whole lot of money. Plus, with your currently medical issues, you may qualify for some kind of temporarily handicapped assistance. If you talk to a human services agent at your local county office, they may be able to find you a bit of help.