my baby is cryin all the time!!!!!

yar i have taken her to atleast 5 different docs already!!! all say shell b fine by 3rd month and def she is colic but i m frustrated that she cries even in day time. ive tried givin gripe water.. it has helped in passing gas thaz all. but it dusnt look like gas to me.. cus how can a baby cry even in day time.. is she hungry? they say if u BF u shud do so after every 20 mins cus they urinate and feel hungry again. after BF if i do leave her alone she is on her own for max 5 mins thaz it!! is she hungry again???