Localized stabbing pain

hi everyone! I’ve been experiencing on and off stabbing pains in the lower outer quadrant of my left breast for a few months now. I am 29 years old and currently tandem breastfeeding my 2 year old and my 9 month old—last week I had mastitis which resolved without the use of antibiotics and just yesterday the stabbing pains started up again after being MIA for about a month. The pain is not bad and if I’m busy I don’t even notice it, but it’s definitely there which has me worried. The pain does not get better or worse when I press on the area of concern. When I rummage around looking for a lump, the only thing I can feel is a very small squishy lump. It’s about half the size of a pea and it moves around. It’s been there since the start of the pain and hasn’t changed at all...I’m not even sure it’s not just normal breast tissue or a milk duct, but the fac that the stabbing sensations occur right where the little squishy lump is has me concerned. I have had a small fibroadenoma in the same breast for around 7 years which has always caused a hightened sense of anxiety. Anyone have similar pains? What was the root cause?