The type of tumor that you had is essential information. Unfortunately, as there are many types of tumors that can be in or around the spinal cord, all with different prognoses and recurrence rates, I cannot make any kind of accurate comment without knowing the kind of tumor that you had.
As for the headache and visual symptoms, an MRI of the brain may be helpful if not already done in the MS workup. If the visual symptoms are new, consider starting with an eye doctor to make sure it's not a primary eye problem. If the symptoms worsen, certainly call you neurologist and see him/her on a more urgent basis as needed. Good luck.