I only had limited nausea but horrible indigestion. I found that nibbling ginger snap biscuits helped with nausea, also stewed apple in tiny amounts. Just trying to keep something in your mouth often helps. Fruit tingles were also fabulous if you let them just sit in your mouth and dissolve. The bicarb in them helps -and they taste good ! Warm showers also helped.
Def 3 weekly, I could not have coped otherwise. I am nearly at the end of that process - only 4 Herceptins to go - yayy !
Best wishes, be kind to yourself.
magicmum