I found out I have arthritis in my spine, do I need to give up playing football?

Not if you love it. Arthritis in the spine is very common, similar to other joints, but it does not mean you have to stop moving. Activity is actually good for the joints and staying fit is important. I do encourage lower impact activities such as an elliptical machine or stairmaster, but if you really enjoy the football, keep playing.
Depends on type. It depends on what type of arthritis you have. There are various types of spinal arthritis and not all type preclude football. Ask your physician in your case.