Alimta treatment duration

Help,I will not bore you with all i have been through with my metastastic small cell lung cancer. I have taken Alimta for about a year.  I am having some side affects that my Oncology Doctor says are not caused by the Alimta, but other docotrs say they are finding are side effects and may get worse.  They are limiting  me getting exercise and going out of the house.  It seems like it is a different set of problems every couple of trreatments.  I live for those good days every 21 days and I am not getting them the last couple of months. My cancer is very stable at this  point. It is just the side effects. Terrible bile taste in my mouth 7/24 and trouble with my equaliberium.  Any help would be appreciated.Thanks and God Bless,Jo