Most of these drugs were already covered, but for the sake of clarity we should group them by their pharmacological action:
1. Magnesium (OTC obviously). You might have to test several different forms of magnesium to see which ones makes you most drowsy. Take 100% daily recommended dosage, but obviously not every day as you already get some from food.
2. Melatonin - one of the most mild and non-addictive sleep aids with virtually 0 side effects (OTC)
3. CBD, works well but can be expensive depending on dosages needed (OTC)
4. Weed also has varying degrees of CBD depending on strain and i would group it into the same class, if drug test is not a problem then its cheaper than CBD oil. Also works well
5. antihistamine - this includes doxylamine (OTC), diphenhydramine (OTC), hydroxyzine. Good thing about them you cant get addicted because they stop working after a few days.
6. Baclofen, GHB, phenibut (OTC) affect GABA-B amongst other things. But i'd only use baclofen as a sleep aid personally.
7. Narcotics. they aren't really good for sleep long-term and also risk of addiction.
8. GABA (OTC). Z-drugs, benzodiazepines, carisoprodol affect GABA-A levels and can be a very slippery slope to addiction (except pure GABA).
9. Antipsychotics are prescription only and a lot of them like quetiapine have anthistaminc activity at lower dosages just like antihistamines, so there's really no point. I'd avoid them personally.
So if i had to rank them in order of health or addiction: Some BS plant extract from your pharmacy > Melatonin >Magnesium> CBD > GABA > Weed > Antihistamine > probably baclofen > GHB / phenibut > Narcotics > z-drugs & benzos (addiction)
If everything up to baclofen works then do not go futher imo, because you risk serious addiction.
EDIT: i forgot to add good ol' magnesium. I use trimagnesium bicitrate* (make sure its quality) 100% dose couple of times a week before bed and it makes me noticably drowsy and sleepy. Now if you're going through benzo withdrawal it might not help on its own (but neither will melatonin or CBD), but if some time has passed it will work and you can combine it with other sleep-aids.