What could be wrong with my arm?

[Tinks]

4 weeks ago I pressure cleaned the verandah, afterwards my arm hurt which I just put down to the vibration from the gurney (sp?). Anyway, 4 weeks on it's still really painful. I can't pick things up without it hurting and I have no strength in that arm or hand at all. I come home from work every day in agony.

I've just left it thinking that tomorrow it will be better but it just isn't getting better. It isn't getting worse either.

I do have Carpal Tunnel, could it be related to that?