At my wits end

2 1/2 month old won’t sleep during the day at all lucky if she sleeps like 2/3 hours. At night she won’t sleep at all unless in someone arms we tried a new bassinet. Trying the snoo now and nothing works. It’s impossible to get anything done other than hold her and feed her and change her. We have no time for ourselves other than dropping her off at grandparents for a few hours to keep our sanity but the crying is just non stop. I read that random crying is supposed to fade by now as she’s closer to 3 months but it seems like it’s the same if not worse. It’s becoming unbearable and I don’t know what to do anymore. My wife is barely getting any sleep and me as well as I try to contain this baby. I love her but last night I got really frustrated and like almost yelled at this poor baby. She is fed diaper change so it’s nothing like that. She eats ok but sometimes eats 2 ounces then starts passing out but by now she should be eating more. I don’t know how to feed her more. We tried a medium flow but she starts choking in that one and the slow flow is too slows for her.