Don't ever worry about phoning them unnecessarily, it is your health, your life, better safe than sorry and listening to you and your concerns is what they get paid to do!!
I know how you feel, i used to turn up at my local emergency department very regularly, suffering from anxiety, which i often felt at the time was something wrong with my lungs. The last time i went, when i got to the same lady i'd had several times in triage, i burst into tears and apologised for continually wasting their time with my silly anxiety attacks. She put both hands on my shoulders and looked me in the eye and said, Kat, you have CF, one of these days something more serious could be wrong, you come in here anytime you feel you need to, we will never judge you for it, this is what we are here for.
I burst into tears again of course because she was so nice about it, but it made me lose my concern and guilt and now i'm not worried about going in there, regardless of my symptoms <img src="i/expressions/face-icon-small-happy.gif" border="0">