Vomiting like feeling. If it is covid?

Hi from few days, I am having a vomiting like feeling and sternum discomfort. Also feel like my stomach is upset sometimes. Had mild fever and bad throat more than a week ago for which I took antibiotic and paracetamol. Also felt like I had a loss of smell for 2-3 days. Not sure if it is covid, couldn't get tested due to ongoing shortage of testing staff. Can someone suggest if the vomiting like feeling is something covid related or something else and about any home remedies. Should I be worried if it is covid? I keep my oxygen level under check and it is around 97-98 and am taking vitamin c tablets. I also tend to have a pain in rib down my right chest from around an year, not sure if that is anyway related but if it is please suggest how should I get that diagnosed.