Hi , During Diwali days most of the pets especially dogs & cats are became so sensitive because of crakers pollution and sounds called an environmental stress !!! Lot of cases are related to Respiratory distress,  ocular discharges , dull and lethargic, loss of appetite, vomitings are can be cause of anxiety or distress or depression and vomitings also caused by sever dehydration - One more reason can be due to lagging of deworming that cause by worm burden in the stomach and intestines, mostly pets eat or sniff or licks on the floor catches lot of infection on it,  so deworming is very very important every 3 months once (Less than 3 months also fine According to situation).

Better consult a nearby vet coz oral meds wont help. Also she needs fluid therapy

Vomiting can be due to so many reasons. Which includes; Infection, Inflammation and foreign body. Since she is not eating food or drinking water properly on top of her Vomiting episodes, she has high risk for dehydration and hypoglycemia. Both are dangerous for the pets life. Kindly take her to nearby veterinary hospital for clinical examination, so that her condition can be properly diagnosed and she can be given specific treatment which is need for her current condition.