My husband was prescribed Xanax last Thursday. He took one pill Thursday evening. Friday evening, he felt exhausted and Saturday, he woke up with muscular aches (similar to a viral infection), loss of appetite and was running a 101.9 temp. On Sunday, he felt better, but still had a slight temp 99.9. He took another Xanax Sunday night and on Monday, he had the same muscular aches, loss of appetite and and 101.2 temp. Could this be an adverse reaction to the Xanax or is it (probably) just coincidental?