Yesterday took 8 benadryl (diphenhydramine) i still feel it .... i think. will i be okay?

Yes: The sedative effects of the Benadryl (diphenhydramine) will resolve. The real question is why you need to take 8 Benadryl (diphenhydramine) in one day. If you require frequent antihistamine dosing for allergies consider taking longer acting non-sedating antihistamines like Zyrtec, Allegra, or Claritin. See an Allergist to make sure you are doing everything necessary to keep your symptoms under control.