My elbow hurts whenever I move it?

My arm has been hurting all day today and yesterday. I didn't really do much yesterday except for move some big branches in our backyard to the fire pit. But it wasn't really heavy or hard to lift. Since then whenever I try to extend my arm, I get this sharp pain right in my elbow and it sort of feels like something is grinding against the bone. I honestly don't know what I did to hurt it but it really really hurts to move. Does anyone know what's wrong? It also feels like something is "popping" sort of whenever I move it. I don't think it's serious enough to go have it checked out but it is painful and getting irritating to not be able to use my right arm. Any tips? Thanks in advance. :)