How much diphenhydramine is safe?!

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I've done diphenhydramine five times (300mg, 600mg, 450mg, 650mg, 600mg) and none of them were exactly "pleasurable" and the four that were above 400mg hurt like hell, but nothing remotely happened when I did 300mg.

What basically happens is around ninety minutes after you take it, things start to disappear before your eyes when you stare at them long enough. You start hearing echoes and voices and start realizing that you intermittently fall into short periods of unconsciousness. If you can keep it together and stay awake, then it's like having a flu. Your body hurts, you have NO desire to move, and some VERY strange things can happen (from personal experience: I took 600mg and then about two hours later started driving to my girlfriends house and once I got their as I was opening my door I was lifting my head up from my desk at home). You can get up and physically do things and have a very lucid recognition of doing them only to find out that you hadn't done anything.

It's all very complex and not fun. I liken it to what having schizophrenia must be like because at times you hear people talking directly to you, and see things that entirely aren't there. Glitches in your vision happen a lot, like you vision "skips" and forms "cracks" that look like spindly arachnid-like creatures. It also feels like you have insects or small things resting on your skin in places.

Honestly it sucks, don't do it.

Experience.