erratic thermometer

I badly need some advice. I'm in the middle of chemo for breast cancer and have to monitor my temperature for signs of infection. I was advised to buy a Braun ear thermometer and it's driving me insane.

The readings are wildly erratic. At one stage it read 39.1 in one ear and 36.9 in the other - which can be the diference bewteen a rush to hospital and not having to worry (my digtal oral thermometer gave a reading of 37.4). The same ear can vary hugely within seconds.

I've just come out of hospital after 5 days of febilre neutropenia. My temperature was reading normal every time they took it in the hospital but as soon as I was home, my thermometer decided I was 38.4.

Has anyone else had this problem? (Some on line reviews would suggest I'm not the only one)
Can someone recommend a reliable ear thermomter?