Hello! I got some starter from a coworker, and for some reason, almost overnight, it went from smelling like dough to smelling like nail polish remover, with lots of little bubbles on the surface. This went on for about two days with one feeding per day, so I upped the feeding to twice a day. The starter smells like buttermilk now, with maybe 4-5 bubbles on top, but there no rising. Am I on the right track to bringing it back to life, or should I start over?