Post transplant I used Compazine 10 mg. worked the best. Side effect was drowsiness. I also used Zofran and continue to use this to control nausea now that I’m home. Regular over the counter antacids were also used while in the hospital.
The key was to take them prior to eating any food or protein drink.
My care team said there were other options available if these did not work.

I will say that these did assist but did not totally remove the nausea /reflux feeling I had during the toughest days 6-10 post transplant / chemo. It also helped by eating small portion, bland type foods every 3-4 hours vs. larger 3 meals. Try crackers, Lara bars, toast, rice, protein drinks (ensure). Believe me, nothing tasted good and had to force myself to try and eat. This was one of the toughest parts of the recovery.

On a positive note, it does get better gradually.I hope your husband finds a medication and diet that works best for him. Get through this next week and hopefully he feels some relief. I am pulling for him. Much positive vibes being sent his way.