Am I at risk for botulism?
It doesn't sound like you have anything to worry about. It's very possible that botulism or some other organism grew in that time in those conditions, so you were right to throw the food away. 

You can't get botulism or other foodborne illnesses from smelling food, you'd have to actually eat the food to get sick, which you wisely didn't do. Thoroughly cleaning the container will get rid of any contamination on it and make it safe to use again. I wouldn't worry about the sink personally, just give it a rinse afterwards.