 [ Symptoms ] hello im 16 and healthy i have experienced an accidental diphenhydramine overdose about 5 weeks ago and i feel drunk i feel as if i am not myself or if i was still under the influence of the drug i feel sleepy and dreamy [ Disease ] hi have a read through this link you could find some help but there is a phone number for poison control they could be of help with long term side effects <link> just copy into google to the www to open and read do hope you find the help you need good luck