What am I doing wrong?

First time mom. Don't get me wrong I love my daughter more then anything in this world. But she seems to be the unhappiest baby. 9 weeks old now and for 9 weeks it's been non stop crying and fussing. I try everything and some things work temporarily like feeding and walking around with her or her swing but then it's back to crying after a few minutes. Her pediatrician sees nothing wrong with her she's pretty gassy at times and give her probiotic (colic drops the pediatrician recommended) and have tried every gas drop on the market, moving her legs, constant burping, warm baths, belly rubs, swings, snuggling, bouncers, walks in her strollers, car rides, hates swaddling, won't take a binky.  she only sleeps for about an hour tops and then it's crying again and me trying all those things again till she eventually passes out after a few hours of crying and me trying to comfort her. I go back to work in 2 weeks and I have it arranged for a friend to watch her but she also has a 12 month old. Scared she won't want to watch her because she is so high maintanence and won't be able to care for them both. (She was going to go to daycare but it is very very expensive here for infants.)