then I would imagine that taking p. chem, anal chem. intrumental analysis, and mega lab (combination of p chem, analy, instrumental, inorganic concepts) all in one semester is a really bad idea, something I'll be going for next semester. dnbwise, I can relate to your situation, and I don't think it's going to be very fun for me either.
I've taken up to differential equations, and I've aced all my math courses so far, I have not taken calc III or linear algebra though...my guess is that it should'nt be too difficult for you, since you have calc III, although some of the derivations (I've taken a peek recently) are still difficult to understand.
I'm just hoping that the four courses would not be so time consuming. An ideal schedule for me would be to take a math course, a major chemistry course, up to three lab courses, however things have just not gone that way for me....if I wish to graduate within one year (that's my priority), I'll need to go with it-I don't plan waiting another year.
As far as Org. Chem goes, it is really time consuming. Like movies said, it is has a somewhat different approach then gen chem, and for most people it requires a lot of memorization. I would not recommend taking org. chem and p. chem at the same time, unless you're mathematically fluent, so that you can breeze through p. chem.