I have pitched my yeast into a 2 1/2 gallon batch of apfelwein about 2 weeks ago. The airlock has not bubbled once since then. It was pitched into a 7 gallon ale pail. I was wondering if there is too much headspace in my fermenter to move the airlock, it isn't even half full. I've used this fermenter about 7 times with no problems. I don't know what the deal is. I broke my hydrometer so I don't have readings unfortunately. It smells like sulfur inside the bucket, and the top of the wort is all bubbles. I don't think it's infected, but something is definitely wrong here. Any ideas as of to what may be happening? It was a full packet of yeast intended for a five gallon batch.