Such intractable depression will take much longer than 6 weeks or even a year to overcome, imo. Please do not give up. If you can work with the last doctor, then do so... there are things bothering you that have been so deeply buried you don't realize they are bothering you, imo.... maybe even death and illness, but you have staid yourself to not feel and over time, you can't even find them to notice them.

It can be better. Keep going.