There's a product called ZZZquil, that is simply diphenhydramine packaged as a sleep aid, you could look up what the active dose is and try and mimic that
I'd like to echo this.
Definitely look for yourself first before buying anything. Assuming pharmacies are the same where you are as here,
@joeylittle is spot on.
The sleeping pill version of diphenhydramine here in Canada is called "Sleep-EZ". It's sold in a pack of 20 for about $20.
The generic version of Benadryl which is the same drug in the same dosage, with no additional or substituted medicinal ingredients. Comes in a bottle of 100 for about $16. Name brand Benadryl is 100 for about $25.
The only difference between all 3 is packaging.
Though again, be sure to read for yourself first of course, in case things are different where you live. Probably not, but it's good to be informed before taking anything.
I do also want to say it one more time that I would try everything else suggested before you go down the sedative route.
The reason I happen to conveniently know an awful lot about this drug and it's packaging, is because it is habit forming. I take it often enough to warrant buying a bottle of 100 despite not having any common allergies.
I take them for sleep and only for sleep. Have for years, they barely do anything for me at all, but can't get even a lousy cat nap without them.
It's fixable, but it take time and many sleepless nights to do. So I remain dependant because it's just slightly more convenient right now.
If you take them. No more than 2-3 days max. Seriously, the rebound insomnia from these is miserable if you over do it.
Hope you can get some sleep, whatever you try. Good luck.