Just my opinion but I would suggest weaning off all medications for the next 10 – 14 days and repeating the psg/mslt. I dont think that simply adding another drug that you would also have to stop before proper testing is a very good idea.
You are correct in that your testing is probably not accurate due to medications but your Physician should have advised you to stop these meds prior to testing.
From your post about all anyone can tell is that you are sleepy and frustrated, are there other symptoms you are experiencing?
What does your daily schedule look like?
How about lab results?
Any more info you could provide may prove helpful with any advice you may find here
Best of luck