In medical jargon, fear of movement is referred to as kinesophobia. In this case, kines refers to movement, and phobia refers to fear.
Although avoiding movement can be helpful in the acute stage of a back injury, nurturing this tendency may get in the way of feeling your best over the long term. This is because developing strong muscles is a key strategy for dealing with common back problems.
Therefore, it may behoove you to get help for your fear or phobia. Doing so may help you participate fully in physical therapy and your home back-exercise program, both known to contribute to successful outcomes in chronic back pain management.