Nausea - anal cancer

Hello All,

I am 13 weeks post chemo/radiation and I'm still experiencing nausea.  The docs say that the effects of the treatment do not typically last this long; however, they haven't come up with any answers yet.  I take medication throughout the day to combat it and follow a no meat, no sugar, mostly dairy free diet.  Did any of you guys experience nausea this long after treatment or does anyone have any suggestions?