Sorry to hear of your issues, rare that there are adverse reactions to the herbs but not impossible given everyone is different and age plays a major factor especially with the function of the liver, seems you are one of the unlucky ones, may possibly be an allergic reaction, hopefully you do find a suitable solution in the end.

How are you taking your temperature? A glass rectal thermometer is the MOST accurate and the gold standard. These thermometers are available on ebay and i have several of them. Its by far the best way and beats having one in your mouth.