Lost my patience

So after I had my second kid I honestly don’t have much patience as I used to and I HATE IT.... my oldest daughter is two years old and ever since I had baby she’s been not listening, and I get she wants my attention, I do play with her and all that but most time I just don’t have the patience to deal with her when she’s being bad... I probably yell at her everyday, and I don’t like to :( but ugh it’s so hard when the baby is crying then she’s there just whining about nothing.. i don’t know what to do.. do I need to give her more attention than I already am? I try to be calm some days and not try to yell but she test my buttons here and there, I’m not the type to spank , I just talk to her or put her in time out in her room and she’ll scream bloody murder till I let her out and it just makes me feel horrible 😭

But idk what to do for her to listen.. She’ll pick the wrong time to do something ,, like I’ll be changing her little sister (2 months) or feeding her and she’ll want me to hold her and will keep saying to hold her till I literally yell at her and tell her “after I’m feeding the baby” or “in a bit I’m busy” sometimes she get mad and say “no hold me” and I just can’t .

She’s a mommy’s girl for sure and I don’t mind it but I wish she’d understand that sometimes I can’t do thing right then and there and she needs to wait ..