"I need to find something with purpose, big money, and satisfaction".
You know, these are great concepts to work for, but make really crappy goals.
"Something with purpose" What sorts of things bring you purpose? Does it need to come from work or can work bring you the means to have purpose elsewhere?
"Big Money": Money only buys some happiness, and the biggest boost is simply getting enough money. What sorts of things can money get you that you don't have now - and how will those things improve your life? If you make decent money, are there ways you can stretch it further? Live in a modest home and so on? Will these things make up for any money you don't have?
"Satisfaction" - again, what brings this? Culture and work environment? Feeling needed? Is there a way to cultivate that where you are? Even more importantly, are there things you can do to make your next job fit this description?
Once you start answering questions like these and have clear, tangible goals it is easier to find the motivation to find them. In addition, I fully recommend making sure you have work-life balance. This includes hobbies and interests that aren't work-related. I also recommend speaking to the doctor once more to consider speaking to a mental health professional, since lack of motivation can be a sign of anxiety or depression.