I've been hitting my putter elbow on everything. it's painful and i'm loosing strength in my arm. could there be more damage than just bruising?

Possible : Yes, it is possible to have ulnar nerve neuropathy ( crazy bone nerve), the nerve at that area very close to the skin and bone, a repetitive trauma cam cause temporary or rarely permanent nerve damage, the early symptoms is tingling in pinky then weakness in the hand or distal arm. The first step in the treatment is avoiding more damage of the nerve. See a local neurologist for correct diagnosis.