High CPK followed by Normal - Lots of Chronic Pain... Thoughts?

Lots of inconsistent muscle and joint pain body wide over the past 3 years accompanied with headaches. Some muscle spasms and twitching. Had a high CPK test of 6944 followed by a normal CPK test of 218. Doctor thinks the first lab might have been a bad lab because I am young and fit. That said, pain and fatigue has been debilitating, but I am just not lazy and do a good job of masking it. What should I do?