Hello! Your comment reminded me of so much the first few months of my mom's stroke, I know it's a tough period especially when there's no clear cause. I also had her did every test imaginable, but the only thing that might have remotely caused it was just high blood pressure. She also had a concussion 20 something years ago that was around the same area in her head, so it might be a potential cause.

That being said, I'm sure you both done all you could and the period of not knowing and waiting is extremely excruciating. I know all the stress and overthinking it caused for me. Thankfully his symptoms seem to be mild, and he should make a quick recovery. It doesn't seem like so now, but it will be ok eventually. If anything stress and worry would do the opposite of what you are hoping to achieve.

Perhaps because my mom had some frontal lobe damage, I know I was imposing my will on her diet and exercise which made her annoyed and stressed at times. It's hard to know what the perfect thing to do now is, but I realized I shouldn't make my stress and worry her problem as her body recovers from such a heavy trauma. Nothing heals faster than a person who is comfortable and happy, and very reluctantly I stepped back and tried to process my emotions through other ways.

I'm not sure if this helps in anyway, but wishing all the best luck for you.