Elbow pain

Good evening, 

About 7 weeks I played 10 pin bowling. Muscles in arm ached next day.  Which I expected.  But

pain has never gone away and is affecting my work as constantly achy and painful if straighten it.  And I struggle to put stock onto the shelves. 

If I press inside crease of elbow one part hurts ...

Any thoughts?

Thanks for reading this. 

You need to consult a Dr.