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

i dunno… doc gve infacol/colicaid for her n they all tell me colic wil last for 3 mnths n shes alredy 2.5 mnths n her cryin spells r not decreasing, only gettin worse day by day. plus unlike reflux symptoms she dusnt spit or vomit.
i dun understnd wen shes sleepy or cryin bcu of gas..its so hrd to differentiate cus either immediately or 5 mins latr of bf she is crying n i just feel like kickin her ass!!! just now after 5mins of bf she was cryb hysterically n i tried pattin her so she cud sleep but continued crying. i put her on my shoulder n she closed her eyes, ws she tired wntd to sleep??but y was she cryin like she ws in pain? i dun mind pickin her up n her slepin on my shoulder…its her wakin up as soon as i put her down that irks me! wen will these days b over… i m scared to death her colic will lst till 6mnths.