1) Tough love: everybody gets grounded sooner or later. Everything good in my life and a lot of cool aviating happened after the AF told me to find a Plan B because of a condition I don't have (that's no longer disqualifying, to boot).
2) Optimism: excel where you are. Amazingly cool things happen in UAV land. This will also set you up for other opportunities as they present themselves (WPS, TPS, something after AD, and who knows...maybe an AF short on pilots might change a few rules).
To some extent, happiness is a choice. While you never have total control, you'll always have influence. Practice a positive mental attitude. That doesn't mean ignoring suck, it means knowing there's always a way through, over, or around.