Gotta push. Also, if you had a better stack, that raise would've been too small anyway. The general rule is that the raise should be 3x the BB + 1 BB for each limper (so the bet's 4x the BB + 1 for the limper). Here, a reasonable raise would've been to 450-500.

Another nice rule to remember is that if anything you're considering doing costs more than 30% of your stack, push or fold. Here, a reasonable raise would be to 450 or so, which is almost half your stack, so this is a clear push (unless you have a read that suggests fold).