You also may be getting sick. I began mine a few springs ago and springs here in AK are still cold and flu season. I was sick as a dog with a URI, and eventually pneumonia. I thought it was the meds until I landed in the hospital with the pneumonia. I thought I was going to die but the ER doc and my rehab doc chatted on the phone and in a few days I felt much better.
I'd call your doctor but always keep in mind, just because we are addicts and dealing with that issue doesn't mean that the regular things like colds and flu can't catch us off guard.