I've had 2 fusions done, one in 1991 C3, C4 and the other in 2001 C4, C5 and C6 with instrumentation. Lately I'm experiencing bad headaches, vertigo and numbness in my legs and also very bad muscle spasms in my arms. My MRI shows that everything looks fine so what could be the problem?. My doctor seems to think this could be the by product from my previous surgeries. Any advice would help.