Jack went to the ENT today, and good news, it seems that his hearing problem is all based on fluid in the ears. The ENT will look at his ears in about 6 weeks to see how they are doing if any of the fluid is draining on its own. If it isn't draining on its own, I imagine they will put tubes in his ears to drain the fluid.
In other Jack news, he gets his cast off on Wednesday. Pretty cool, though it will be a pain to put him in his brace constantly.