Painful armpit clear ultrasound

Hello
I am a 27 year old breastfeeding woman
Since last week i have pain in my left armpit , the area above my breast with the feeling of pins and needles in my breast
Breastfeeding is uncomfortable from that side
I cant left my arm or lie down from thr pain as it does radiate to my arm and back

Did a breast ultrasound but it came back clear and no mastitis no lumps
Had bi rads 1 score
Doctor said it is not something breast related and i had to live with it
Dont know what it is
Did anyone have a problem like that?