I took 800mg of advil pm in about 8 hours. and took a benadryl (diphenhydramine). i still haven't been able to sleep ans and im super dizzy! did i take too much meds?

Benadryl (diphenhydramine) can cause: Dizziness or low blood pressure. You did not take too much, but its metabolism is blocked by Prozac which is also metabolized through the cytochrome p4502d6 enzyme system in the liver, so you are probably experiencing a higher than normal blood level of benadryl (diphenhydramine). In 1960 it was found that Benadryl (diphenhydramine) had ssri functions. This led to the search for and eventual discovery of prozac. Best wishes.