Mastitis? Help!!

So I’m not sure if I have mastitis but the top of my boob has been sore for couple day like by my chest into my armpit and shoulder hurt feels like bad bruised or something. I had yellow sticky stuff coming out of one spot of my nipple yesterday. And I had diarrhea and headache and didn’t feel well. I don’t have a lump or red spot. Is this mastitis? Help!