I had pericarditis back in september last year, i still have the odd pain in my chest and my right arm has started going dead lot, it is also painful?

ECHO: I suggest doing a Echocardiogram to follow up to make sure that there is no residual or accumulating pericardial effusion. Odd pains are some times common after an episode of pericarditis. Unclear why your R arm is going dead - could be positional... Have a doc check up to make sure that the blood flow in R arm is adequate and not compromised (can be done by comparing pulse in both arms)