“Pretty sure” benign breast tumor / spreading to lymph nodes?

Hi, I posted on here a year or so ago. I am 25 and found a lump in my breast 2 years ago while pregnant with my son. I had it ultrasounded after giving birth and they diagnosed it as a tumor which “I’m pretty sure it’s been benign” were the exact words of the dr. They did not do any testing as I was breast feeding and he didn’t need want to do a biopsie and ruin my milk supply? Anyway. I’ve been going in for follow up ultrasounds and they say it doesn’t need seam to begrowing which is a good sign. But I also am no longer breast feeding and my boobs are deflated haha. I don’t dont know If that could be making the tumor look smaller or not.

I've recently been having aching dull pain in my collarbone area and neck for the past few weeks. It's gradually getting worse and a little swollen above my collar bone and now I can physically feel a bump. There is also a bump in my arm on the side right in the crease of my arm, and below it. My armpit is loosing feeling here and there and is EXTREMELY itchy (more above my armpit) that's been happening for a few months now. I'm just not sure if I should go to urgent care as I don't have a primary care dr. I don't know if any of this could be related or if maybe the tumor is actually malignant and may be spreading to lymph nodes. Any advice or similar experiences would be great thanks!