Took three allergy tablets?

Okay I took two Walgreens brand Wal-Dryl Allergy brands. the front say Diphenhydramine HCI 25 mg ANTIHISTAMINE. For Allergy relief: (lists things). The dosage is adults and children 12 years and under: 1 or 2 tablets.Take every 4 to six hours. I accidently took all three at once (something fell and broke so I forget I took two already and we back and took 1 more) It also say's don't take more than 6 doses in 24 hours....? Help...am I going to die? Sick? Pass out from sleepyness? Thanks...:D