ASTAC,
I'd say get out if it's that painful for you. Leverage your military experience into a good civvy job. While you're at it, enter politics. Start small by joining local councils, school boards, etc., then grow. County, etc. Get active in the local party politics.
Seriously, it sounds like you have serious reservations about what you're doing and with the military actively engaged in combat right now, the last thing you need to do is keep doing what you're doing. Reservations in combat can result in unnecessary deaths and then you'd either feel worse, or be dead and everyone else would feel worse. The paycheck just isn't worth it if you're heart's not in the game IMHO. You can get paid a lot more for doing a less dangerous job somewhere else.
For what it's worth, lots of people feel the same way but everyone has their own reasons for doing what they do. As an example, the recent push to abolish the posse comitatus act is something I hoped I would never see, because it basically says that the fed govt can push federal troops into any state at any time for any reason the govt comes up with. Given the jackbooted nature of the homeland security department that gobbled up FEMA, how long do you think it will take before a real or imagined emergency results in the Army being sent into an area against the wishes of a state?
If I was a state governor and FEMA or homeland security pushed Fed troops into my state, I'd mobilize the state natl guard AGAINST them, and make them fight their way in. It's a clear violation of states rights, and NOBODY can order me to fire on Americans within the borders of the US. That's not a role the US military has ever wanted or should ever have, but guess what - it's already been authorized while everyone was fixated on the hurricanes.
Would I quit NOW? No. Would I disobey an unconstitutional order to invade a state? You bet your bellybutton I would. I hope my superiors feel the same way.