I'm so sorry you are so miserable. Have you tried medication? That is all that makes me better.I had to go back to mt pdoc for 2 years to get the right mix of meds but it works for me.
It takes so much energy to put on a happy face and go out into the world. Then to come home to an empty apt. is really sad. Have you ever thought of getting a little pet? Parakeets are wonderful company but they need companionship. If you aren't home much of the day 2 parakeets would be best. Another great choice is white mice or rats. My niece has a female white rat and she is so affectionate and sweet. She's really clean also( the rat, not my niece).
I haven't got any friends either. Don't know why.
If I could figure out a way to gather up all the folks on this forum who can't find friends and be a group or something I would. Then we'd have each other.
I hope your new T is good