Nausea

I have had 4 rounds of A/C.  The first 3 I got through pretty good.  I took the ainti-nausea meds for 3 days and was Ok with some fatigue.  The last round -- last Thurs -- was different.  The nausea started that day and has gotten worse, even with Zofran and Compazine.  The last 2 days have been very bad -- 4 and 5 days after chemo.  Today I went to MO and they gave hydration in a drip.  I felt better after but it is starting again.  I have been trying to drink lots of water and have even eaten a little, but food is not what I want.  That was my last round of A/C.  In 3 weeks I start Taxol and Herceptin.  Will this ever go away???  I feel the nausea in my tongue.  Is my body or the cancer fighting back?