Arm pit lumps

I have been feeling like there is some sort of lump every so often when my arm brushes by my side. I couldn't find anything but it's happened numerous times over the past couple of weeks, maybe even months... then last week I found a lump under my armpit and went to see the doctor on Thursday. Hes referring me for an ultrasound but said as I do a lot of exercise, it's quite possible a blocked duct or something. Tonight however, I have found another lump near to the first, just a bit higher up. They are both around 1.5cm. I've felt quite a bit of aching in the side of my boob/chest and also felt some sharp shooting pains earlier that took my breath.

I am feeling very worried. Especially now there is more than one. They are firm in texture but move about if I like roll them in my fingers. One is more in the skin and the other a bit deeper. 

I dont know who to turn to for support.

I'm currently off sick from work as my 3 year old has multiple health problems and I am so so worried that now it's going to be me that is the one who's really poorly... 

Should I be worried hes sending me straight for an ultrasound??