Yes, I often feel pain in certain parts of my body more than others. I was diagnosed about 4 years ago, and ever since, I have felt like different pains come and go. For a month or two at a time, it will be primarily my lower back... Then the next few weeks/ months, I will feel the most aches in my arms and legs. In fact, when my family asks "What's hurting you today?" I'll often answer, "Well, EVERYTHING, but mostly ________." It definitely changes.
However, from time to time I will write a journal entry about what hurts and where. I came across one that I had written back in July 2009, and I was actually surprised to see how SIMILAR my symptoms were between then and now. I thought the pain had shifted greatly, when in reality, I just forgot! (#FibroFog, amiright?) Maybe you should consider tracking your symptoms once or twice a month?
That being said, YOU know your body better than anyone else does. Don't make excuses for your FM and fail to treat other ailments. It's very possible that your elbow could use some TLC. Sometimes I blame my FM for every ache, but the truth is, we are not impervious to other, unrelated pains! Get it checked out. If all you get is an eye roll, then get a second opinion. Trust yourself.
Hope you feel relief soon!