I can say in my experience, after 3 day no sleep h binge, when its obvious im coming down, i might have a few beers, i can prob get through max 5 beers before i feel sick and know its enough. I have found that your own experience and perception in these matters is your best guide. Obviously you want to initially know what is safe as a starting point but after that everybody is different. For me, when using H i dont want to take anything else but when still quite high and coming down noticably and feeling shitty, a few beers do help, max three/five.
I will say the biggest scariest mistake i have ever made in my life is taking Seroquel or any anti psychotic after coming down from H, even hours after. I made this mistake accidently twice and is the closest i have ever felt to death. Incredibly fast heartbeat and anxiety that feels like its about to explode out of your chest. Never ever mix these two ever. Unlike anxiety like with stims where you often might feel like you are near death, this was an absolute assurance i was near death, no anxiety, just 100% clear headed realisation that i almost died. Worst thing ever.