@Universal Your bum will probably have a go tomorrow :(
I found soda water was useful, it generated gas so at least I could have a satisfying burp, on my terms. It also helped with the dread mouth fuzz which will probably arrive in the next couple of days. If you are struggling with nausea, ask for some antiemetics--it's better to keep on top of these things before it all turn into a spewfest. I know, it's more wretched pills, but you don't want the alternative. Those drugs do lead to constipation--I found prunes were my friend and make sure you consume a bit of good quality oil in your diet. Coconut oil worked for me. I don't know if pro/prebiotics helped, but I took them anyway.
Chemo really interrupts your gut bacteria. No-one tells you this stuff before hand, but I can assure you your experience is really common. You may find that foods you enjoyed previously suddenly become unacceptable--that a personal trial and error situation that we have to plough through too. Mxx