Completely normal, I promise. Chances are that you entered into this new phase of your life when your life was already jam packed. Now add on planning an event that's supposedly going to be one of the best and most important days of your life. Oh, and everyone you know and love is going to be there to experience it with you. Yeah- I think that's fair game for a maxed out stress card.
Here's how I look at it. Think about your school days. Some of the times are the best memories ever (Homecoming). Some decisions were excruciating (picking a major). Some of the days were rough beyond rough (Finals). But how great was graduation- the party afterwards?
So much like planning your wedding- yes its work, but the payoff is unreal and you could have never imagined it would have actually turned out as phenomenal as it actually does.
So when you're feeling a meltdown coming on because you can't find a band that's perfect- take a deep breath and remember this is just "a class you have to take".
Then go to the spa and get a massage. lol