SAAM_If you're seeing a psychologist you really need to open up with them about this. Lack of motivation can be a symptom of something larger and if you feel like shit all the time it's hard to realize the consequences of not getting through school. If you're taking meds and still feeling like that it could be that those are only hurting the problem.
You shouldn't worry about telling the truth with your doctor though and it can feel pretty good to express what you're going through, especially to someone who can help you as much as a psychologist.
I'm on adderall for ADHD, which helps a lot. I like my psychologist, but I don't wanna admit that I'm trying to get on my feet and failing over and over and over again