Depression or misunderstanding my feelings?

Not sure if i have depression or am just really down about myself right now. I have a 2 1/2 year old daughter who I adore so much but feel I don't get to spend quality one on one time with her due to work, we need the money as partners job isn't reliable atm. Iv always wanted to be a stay at home mum and put my full attention on my kids but feel I haven't been able to do that! I'm also taking it out on my partner which I can't seem to help.. I do love him but we have been fighting a lot lately and I just don't know. It's putting a big weight on our relationship and he never gets why I get so upset or why I'm always so tired.. Help!!!