Are you taking a probiotic?
That is definitely recommended. I take California Gold Lactobif 30 which has 8 different strains. Make sure you leave time between when you take the antibiotics and the probiotic (from what I have read at least 4 hours). I take the Azithromycin and Ethambutol in the morning after breakfast so I can take my probiotic at 12 noon and the Rifampin (on an empty stomach) at 9pm before I go to bed. Even though I started the probiotic when I started the antibiotics I still had nausea the first few weeks.
I purchased Sea Band Accupressure Wrist Bands and they definitely worked for me. Fortunately, after about 3 weeks the nausea went away. Hope you find something that works for you or adjust to the meds before too long. Best wishes.