Best way to deal with the comedown IMO is to do some smack, just be careful not to overdo it as the coke/crack will mask the effects of the H if it's still in your body. If heroin isn't your thing you can try out some benzos to ease the comedown, I used to take 1 or 2 mg of ativan if i didn't have any H around, that helped, k-pins help too, but it seemed as if i needed more than it was worth wasting on covering up a comedown.
Oh and just as a sidenote, I notice your comment on how you're not a crackhead you just use once a week. I was just curious how long you've been using "once a week" for. Just because that's how I started out with H, well it started as once or twice a month, and quickly grew to everyday. Luckily I am in the process of getting off the shit, it's tough like most people say, but it's possible. I guess all I'm trying to say is to watch yourself cuz it can grab a hold of you, but if you're able to keep to once a week, then that's awesome and I'd say keep it that way and be safe.