The sudden shock of seeing yourself go from mostly-human to mostly-cat breaks you out of panic mode, and you suddenly realize what a stupid thing you did. Any messing around with these potions is just playing Russan Roulette; you got off really easy, actually, considering that you're still bipedal and have opposable thumbs. You're free from the obedience spell, that was lucky, but the thought of how much worse things could've turned out makes you shudder.
It's not worth it, you decide, to try more potions. For one that could change you back, there might be a dozen that would make you fully some kind of animal, or worse yet, erase your memories of your original self. Besides, if magic exists, there's got to be a more reliable method of changing back out there.
Aided by some kind of new feline stealth, you make your way out of the witch's house without getting caught, then hightail it into the woods. You might be lost, but at least you're away from the witch. Besides, as a predator, you should be able to survive by hunting until you find your way out of the woods.
Sighing at just how wrong your day has gone, you head off into the woods, a sleek black cat-woman in a maid's outfit. This is going to be an interesting adventure.