That sounds concerning.
I am surprised that physicians you have seen have not taken this seriously. I am not you, but if I were, I think I would keep seeing different physicians until I would find one who takes this seriously.
I am so sorry you are suffering this, and that you are in the unhappy situation you describe. Lacking energy and motivation can be brutal. I wish I had something better to offer you but sadly I am at a loss. Hopefully other members here will see your post and respond with something more helpful.
I suffer from low energy and motivation when I am depressed but there are probably many things that can cause these symptoms.