Your in a band? What kind of music? I'm a DJ (just a small side business). I know the feeling, been double booked before, that's the sign of a poor manager. I've been djing the same bar for about a year. Our first night with the gig he double booked us but we were so early to the gig we talked him into canceling the other DJ. We've also gotten calls from him asking us to DJ with only a few hours notice a couple times. We did it but wanted more money and got it. One time we went straight from a wedding to the bar with only an hour between gigs. It's shows an unorganized manager and a bar that will keep having that recurring problem. Probably for the best if you cut ties. We overstayed our welcome and now need an exit strategy.
I know a couple bars that a constantly looking for live music. Hit me up. I'm out in MTK alot and I'll avoid the tuna.