Iam 65 Years Old And Suffer From Depression. Iam Taking

Iam 65 years old and suffer from depression. Iam taking Testosterone patches which helps a lot. Are there supplements like amino acids or vitamins that can help with this problem? Iam sure that its a hormones that are depleted due to age and I would like to find a way to boost whatever is lacking. I had a mini stroke 5 years ago of the right cerebral hemisphere which seamed to triggered the whole problem.
I also suffer from Diabetes which Is being treated with metformin and gluepage could this be an underlying factor? Also on a CPAK machine. Weight 299 5'11" enrolled in a weight loss program. Iam in care of VA doctors.