Hello,
I have to admit the elbow is definitely not "my" joint, however due to the nature of your sports and the problems you are describing I would suggest you get it checked out by a therapist who is experienced with elbow injuries, preferably one interested in sports.
It could be a whole range of things, have you tried using ice/anti inflammatories if you can take them?
I think it'd definitely be a good idea to get it checked out which will give you a better idea of what is causing the problem, and then you can develop this into a strategy to reduce the pain and hopefully completely alleviate it!
Good luck, and let us know how it goes!
Ruth Cheesley BSc(Hons) MSc MCSP
Chartered Physiotherapist