About 8 Weeks Ago I Developed A Peas Sized Lump

About 8 weeks ago I developed a peas sized lump in my armpit, that you have to push on it to feel it. I just haven't been feeling right lately. I am more tired lately, feeling dizzy and weak and just have not been feeling like my self. I went to get the lump checked out because I have also had a boil in my other armpit since then and a yeast infection. But the walk in clinic doctor told me to only worry about it if it gets bigger. It's been there for a while now, doesn't hurt, and it's not mobile. Should I be concerned or get another check on it?