Roger, if it were me and I was in the beginning search for the cure to my depression. Actually I have battled it for many, many years. Here's what I'd do.
I would go to a natural doctor and have a hormonal as well as nutrition tests done.
Look into orthomolecular medicine. It treats illnes this way..by giving the body what it needs...hormones, vitamins, proper fats in the dosages needed, and by doing tests to find the deficiencies.
Also go to the depression forum on curezone and look up my posts/ under dar7726 for more on things that I've found out. Also check out my posts on paxilprogress
There are many causes to depression and hopefully you know that drugs are not the way. They almost killed me. Also they cause weight gain, insomnia, screw up your hormones, and increase depression starting a cycle that you can not win.