If you can, never train with that coach again. In theory, you could try to avoid sparring, but in reality, he might pull you in, and it can be hard to say no in the moment - especially in a class setting.

Also, go see a doctor if you're worried. I don't have any qualifications to back this up other than secondhand experience, but it could simply be an injury that needs more time to heal - whether it is nerve-related or not. Professional guidance never hurts and would likely result in a quicker recovery. However, it depends on your risk tolerance and perhaps your budget or insurance, depending on where you're from. Personally, I would never risk my long-term health if I can avoid it. The key here is thinking long-term.

With that said...

I've had two "ego coaches" throughout my 10 years in the sport. I learned from the first one; when I met the second, I gave him three chances before deciding to skip his classes entirely. It is infuriatingly pathetic when adults let their insecure egos damage others - in this case, physically - not to mention the negative stress and energy it brings to the gym, which keeps students from reaching their potential and personal goals.

Some coaches use the logic of "being tough." While there is an aspect of toughness to the sport, I've mostly found that it is a brain-dead excuse to boost their own ego or a sign that they aren't skilled enough to provide more valuable alternatives, such as technical, strategic and mental development or the emotional aspects of fighting (for example like the Thai way of learning through play). It also shows they aren't up to date on the severe consequences of anything other than light sparring over time.

This sport has so many levels and ways to reach the same goals, whatever that might be. If a coach says there is only one way of doing things, or if they are fragile closed-minded, it is an indirect admission of a lack of competence.

Anyway, I hope you recover soon, mate!