The reason why I suggested trazodone being a better option was because it doesn't block acetylcholine receptors like diphenhydramine does....I also said "low dose trazodone" too which is 25mg. Also, I never said to take it everyday and get physically dependent on it. And it isn't going to have a worse WD than benzos even if you did take buckets of that crap everyday.
BBB, the reason why it sedates is because of histamine receptors, same thing like diphenhydramine. It's the H2 receptor blockade that creates the heavy sedation.
I would imagine there is some type of cross tolerance with all these types of drugs we are talking about now based on the pharmacology, that you can view on wikipedia. You can look on wikipedia to see the pharmacology of any medication and figure all this stuff out easily if you understand some basics. This sums it up....
"Low doses exploit trazodone's potent actions as a 5-HT2A receptor antagonist, and its properties as an antagonist of H1 and α1-adrenergic receptors, but do not adequately exploit its SERT or 5-HT2C inhibition properties, which are weaker."
I filled a script of trazodone a few months ago. I haven't taken any at all but plan to if I can't sleep possibly.
BBB maybe you should get a script and fill it and just alternate by taking low dose trazodone and diphenhydramine every other week. That's what I would do anyways.