Watch out if you're going to bleach it again. I say use some reconstructors first before you bleach it again to try and get some protein/health back into your hair. If you go light to dark and back to light again, there can be a high chance of breakage and snapping. (I found out the hard way) You'd be happy to have the color you have on right now than having all these short pieces all around your head =P
edit: I hit enter too early... I would wait unless you have something big coming up if you... if you can you might want to start using puppy shampoo that strips color pretty well I hear