Why do I feel slightly dizzy before bed and upon waking?

call a doctor, it could be that your meds are interacting with one another. also you might want to tell him/her that you have diabetes and get checked for it, that may also be a problem with it. all meds lost effects after awhile you might want to mention that as well. you might want to (if you can afford it) get a 2nd option on your meds/health issues.