Yes, I can relate to finding it harder and harder to get motivated, and to leave the house, been there. I'm sorry you're not finding the doctors helpful, but hopefully the scan will provide some answers.
I really hope it does for the better. You sound quite frustrated, even angry maybe? Can you use some of that energy to get out and do something today? Say to yourself 'what the hell, I'm going to go and do something, go somewhere nice, treat myself to something, get in touch with someone'? Take a risk in it turning out to be positive?