I'm not a Dr and I am not trying to be one in these forums but when you suffer from depression for years as I have you tend to learn as much as you can about it so you can beat it.The incompetency of some of the doctors I have dealt with in regards to depression is mind bending. I think a full hormone panel should be one of the first steps when evaluating a new patient and go from there. In my case SSRI's made me feel worse, tired, unmotivated, and totally uninterested is sex. I was miserable. Their solution was always the same, try another SSRI after a while I had had enough and started to do research, and a lot of it.
Remeron is actually not an SSRI but an NaSSA it's not supposed to have few sexual sides but it did for me. It is so sedating it is often used as a sleep aid.