You're right...that is sickening.
Sorry man.
If you go back to the area and see the same truck...write down the info..plate#, make & model..color..etc.
Otherwise try to shake it off and keep it fun.
I've heard so many of these stories and witnessed a couple on public land that I don't wait for the deer to die anymore.
I get up and start trailing.
I know you said you were shaky and didn't want to climb down until you collected yourself...which was smart.
...could of ended up in the ER (or worse) which is way worse than losing the deer.
I've felt the same shakes after the shot....it's actually one of the reasons I switched to ground hunting only....lol
So...give a call to the local authorities...tell them what you can remember.
If you happen to see the the SOB's out there again..get the info and call the authorities to add to the report.
...other than that..brush it off..and relish the feeling of accomplishment...I mean...YOU KILLED AN OLD BUCK ON PUBLIC LAND WITH A TRAD BOW!!!
No one can steal that from you!