I had a hard time with some meds. I dont remember which one it was, but it caused me to be really really tired all the time. it was an antidepressant.
my brother had a similar reaction.
he got on prozac after acting suicidal (about 20 years ago.)
it was supposed to help him, but he just slept all the time.
we couldnt even get him to clean his room, go to school or shower.

many years later he did fine on Lexapro.
so maybe your doctor can help you find another med, if that's what the problem is.