I've also had a pretty bad cough for a really long time. Maybe it's all related. It just feels slightly worse every day though the numbness switches around and some days one hand is worse than the other with pain. I'm not sure whether to try and stick it out 8 days until my appointment or call my doctor's office (which doesn't have an official urgent care service) and tell them I feel my symptoms are urgent. Every day just makes me more panicked, which I'm sure doesn't help my health either.
I would see a doctor and ask to be checked for diabetes, the vision and numbness can correlate to the beginning of diabetes, Usually, an A1C can determine if you have it or not.
Also, I would see a chiropractor, pinched nerves in the neck and other areas, can cause numbness and blurry vision.