I Went To An Urgent Care Facility Yesterday, And After

I went to an urgent care facility yesterday, and after exam and xr of my lower spine Dr. Fox said I have a vertebra that has shifted sideways (ankylising spondylosis? or something like that is what he said) and is impinging on nerves already. He said I should follow-up with my primary care doc immediately, and "be careful" - don't fall, etc.
We just moved to the Seattle area about 6 wks ago, and I don't have a primary doc here yet. This is excruciating, and now pretty scary. Should I go to the ER?
I don't know if it's relevant but I also have MS.
Thank you!!