I do hope you have seen a doctor about this. You must find some help because you are thinking about suicide, and that is really very serious. People with depression are not crazy, they have an illness.
What help have you had over the last 10 years? Depression can be treated in different ways, and you need to find out what can help you to relieve these things you are going through. If you are hearing voices, then you definitely need help now.
Please don't deal with this alone.
I want you to be encourage Jenny! Try light tapping on your body all over if you can (you can look it up under EFT on the web). See if this help with you relaxing and thinking good thoughts. I suffer from Arthritis an the depression is getting to me. Remember to tell yourself you are in control and I truly wish you the best!