Hi LauraBeth. I'm going to put a couple things here, but don't know if they'll be helpful.
First, check with your case worker at social services to see if there is any special fund for emergencies. Also, is there a free clinic you can go to? Is your doctor through the insurance? Do you think s/he could get you some samples? You could also try local churches, United Way, or call 211. You may actually want to start with 211, come to think of it.

I hope you can get some help.