I haven't any relevent tips on how to optimise your voice best for rock, (need to wait for the experts on this one), but I could give you a couple of leads on the tummy aches and dry throat...
Your tummy might be hurting because you're swallowing air when you breathe, and generally swallowing more air when you sing. Your mouth tends to get dry after that, and how your body reacts is it'll produce more saliva and possibly results in you swallowing more and causing your tummy gastrics..
It's best to avoid singing in dry areas, places with high humidity or smoke. Alcohol is definitely not gonna help, but I know some rock vocalists rely on it so I'll leave that bit to you to decide. I wouldn't recommend it tho, since everything's already quite dry. If the environment's dry then you have to double up on hydration / drink more (warm) water before you start singing. Hot coffee (or any other temp for that matter) is a definite no no cos it dries things up.... so if you're a coffee drinker, keep it to once a day..
Another tip is.. judging by the music you're singing, there's probably gonna be some pressure caused in your abdomen as the diaphragm pushes upwards, so if you're gonna keep yourself hydrated, don't drink by the bulk cos a water-bloated tummy is gonna be uncomfortable singing songs like that (IMO lah).
Might want to reconsider having a light meal about 15-25 mins before singing, and hydrate /prep yourself before singing to counter this out.
As for the rock voice question... must wait till the rockers reply

Our regular rock softies would recommend smoking or alcohol though, and it does work but there's no guarantee on it, and the health and state of your vox cords and esophagus would be at risk.
Personally .. for me, the best way to be a (safe) rock vocalist is to adapt to speaking like a rocker till your voice tunes up to its style naturally and you don't have to push yourself or your throat too much to sing rock and lessen risking them out to damage..
Oh wait, there's an article over at melissa cross that could help you with the nodule-rock insight.
http://www.melissacross.com/vocal_lessons.php
I think it's under the damage control link, you could check that out and enlighten yourself ~
Hope the tips helped, happy lunchin~