This topic came up about a month ago.
Pell Grant, enrollment in two schools
Not great news for you, but two of the people who offered answers in that earlier thread are actual financial aid officers, so I think that's a pretty definitive answer. It would at least be worth going in and explaining your situation at your primary college. I doubt they can do much, but it doesn't hurt for them to be aware of your predicament. They've probably encountered it before and may have some other information that would at least help put it all in perspective for you, and who knows... if there is some kind of work-around, you won't know if you don't ask.