Nausea and Vomiting feeling. Recovering.

Hi I was Covid Positive and discharged from hospital 22 days back. Recovery has been good and no other issues apart from mild weakness. Since 2 days I have been feeling vomiting sensation when I drink water after meals. If I don't drink water after meals I don't feel vomiting sensation. Since last three days I traveled in cab for 30 to 40 kms daily and was always at back seat it causes intense vomiting and nausea feeling. Also one more recent habit I indulged in was walking after meals and sometimes I walk faster than normal rate. Burping is there since two days. Sometimes acidity feeling too. Since last two to three days these all I have been facing. Before that I never had any issue for 20 days while recovering.