there are a lot of exercises etc that you could be doing!

"golfers elbow" and "Wikipedia reference-linktennis elbow" can be complicated conditions to treat at times especially when symptoms have been around for a year as you say. causative factors can be multifactorial and trying to deal with each of them here on a message board is difficult.

you say that the pain is causing you to have to stop work at times? i would recommend seeing an experienced physio who can assess you fully and deal with each issue. it'd be worth spendin a few bob to get to the root of the problem no? there are physio protocols for these conditions that have shown to be effective so give it a go.