I'm so confused........i felt hot so i checked my temperature the first reading was the thermometer beeping at me flashing "HI" on the screen, the second was 38.7 and i was on the phone for 20 mins and its now saying 35.7.... is it normal to be high then just drop down to low? or maybe my thermometer is broken..

I'm on two different antibiotics which side effects can be fevers... i also have a mind splitting headache that nurofen plus isnt helping with at all..