Thanks for posting your query
Persistance of tenderness (painful to touch) over elbow even after 3 weeks points towards some bony injury. You need an xray to rule out any fracture
. It might be a bony contusion
which takes more time to heal. Tingling
in thumb and fingers might occurs due to pressure over superficial nerve fibres during injury.
So I suggest you to consult an orthopaedic Surgeon
for thorough examination and treatment plan according to that.
Hope this Will helps you
Dr Saurabh Gupta