I have to work, take care of the house, the children, and my wife. She is in an adult day care during the time I am at work. I am finding it harder to do day after day. Congratulations for recognizing the signs of depression and seeking resources that will help. They could tell you about support groups and make other information available to you.
Support groups can be very effective for some people.
Others find help by exchanging ideas with other caregivers on the internet, reading caregiver books, or seeking other avenues of help. Each of us reacts differently to the type of help that best suits our needs. I'd definitely contact a doctor and discuss your feelings of depression. You need to take care of yourself in order to continue caring for your family. Good luck to you.