Fusion C2-T1 pre-surgery symptoms

I have already been fused L3-S1 and then C4-C6. Pretty darn, successful. But as we know, it puts stress on other structures and evidently, I have really bad genes, because the arthritis in my neck is very bad.And I did suffer a fall down the stairs about six months ago. Of course, I have pain. We all have pain on this forum. However, my main complaint is that my legs are weak. My numbness of my feet and walking and mobility is extremely limited. I must choose a walker. I am generally very fit and active. These symptoms came on this bad in about a course of four months. Has anyone else has anything like this? Has anyone had this kind of
Mobility/numbness issues that came on this quickly? And did cervical fusion, restore your mobility?