hey guys, i recently changed my workout routine from more reps with lighter weight to more weight with lower reps. i've been on it for two weeks. towards the end of the second week my left elbow has been killing me. i've never had joint pains so i cannot say specifically what type of injury it is. i think my joints are not used to lifting such heavy weights, even though my muscles are up to the task. i am 25, 6'2'', 190 lbs, ~15% body fat, and been working out for 2 years. i have never taken aas. is this something that should go away, or should i take some time off (1-2 weeks???). thanks for the input