increase in symptoms from xanax??

Ive been taking xanax every day for the past.... 4 days? I couldn't have exceeded 2mg in a day... but its been about a day and a half since I last took any and im like exhausted ;_; and my heart really feels strange. I have had heart palpitations because of lyme but havent really had any in a long time. i had some the last time i took it and since then my chest just feels so sore. I understand the fatigue a little, but not so much the chest/heart pain. Anyone ever experience anything similar?