Hi, Sheila
welcome to the forum - glad that you found us, sorry that you had to. Hopefully, someone will be able to help with suggestions on manuvering Medicare to get the help you need on the tooth situation and the depression. Having had a recent run-in with depression due to my auto-immune disorders, I have a great deal of sympathy to other sufferers - and also understand how much better it is possible to feel once you get some help.
It sounds like it's hard for you to feel positive about yourself, but I think you're brave and wonderful and have a lot to offer the world. I don't know if you are an animal lover or not, but if you are, you might see if you could volunteer at a cat or dog shelter, or help at a theraputic riding center. The volunteers at these places won't judge you, and the animals won't care - they need love and attention. If transportation is a problem, you might try talking their volunteer coordinator - maybe share a ride.
Take care and hope to hear from you soon.
Maria