Steroids and depression

I stopped using tren and deca and test about 8 months ago. I used them for far too long. I am currently suffering from sever depression. The depression started about 6 months after discontinuing steroid use. My question is can my depression be cause by this prior steroid use. Keep in mind the gap between stopping the droid use and the start of the depression. Has anyone experienced this? If so how could the roids have caused this? Please help... please do not flame me. I am going through to much already