Suggest Medication For Loss Of Appetite Due To Vomiting

Hi, my baby girl is 1 year and 7 months old, she used to eat as we thought was ok as per her age and used to take 250ml of milk as 1 feed but now a days she doesnt like to eat food and also is not liking milk. Actually she was down with viral fever 10 days back and after she recovered she started vomiting all of a sudden after a day. The day she started vomiting she totally left food and milk. i m a working mother so in the day there is no scope of my milk but at night i give. Now i dont know how but somehow she has started eating but not that much, she is sometimes taking 50-100 ml at a time or max upto 150 ml. Also she is always irritated and her left thumb is in her mouth everytime. Pls help me in making her eat and drink more and also how to get rid of her habit of thumb in her mouth