Can a rotator cuff tear heal on its own without surgery? what do i have to do?

No: A rotator cuff tear is like a tear in ur jeans. It only gets bigger unless u take it 2 a seamstres and have it repaired. It may sail along 4 a while and then like catching ur foot in the hole in the jeans, it sudenly gets bigger and the cuff pain is suddenly worse. Get it fixed!

Depends: http://www.theshouldercenter.com/rotator-cuff-tear.htm an acute injury can result in significant weakness but not mean that there is a large tear. We need more information and a clearer extent of pathology and diagnosis. A drop arm test by itself is not sufficient to make the decision for surgery. Consider a more detailed evaluation with a shoulder specialist to review your options.

Rotator Cuff: Depends on the size and thickness. Partial thickness tears can heal if they are less than 50% of the thickness of the tendon. Full thickness (complete) tears generally will not heal on their own and will often enlarge with time.