Talk to Rob @ NW about the driveshaft bearing. They are REALLY expensive at the dealer but he has the hook up and for a great price. Hope that solves that issue. As for the IC, doesn't sound like any fun. 3 gallons in 3 days is a LOT of coolant to be losing. Sad to say it but you're gonna need to get that corrected ASAP and I'd recommend you park the vehicle until this is corrected.

Take care and enjoy the new car (after of course you get it back up in tip-top shape)