[ElaineM]

I wonder if it would be better to wait until you get the pet scan results to change the medicine completely.
Even though the tumor markers are going up you don't know where the potential problem may be. Some medicines might work better in different parts of the body than others.
Take good care of yourself in other areas. Eat healthy food, get enough sleep, get some exercise and fresh air in the next few weeks until you get the scan.