Hi. I have posted before about a lump in left breast. Dr has confirmed its around 2 cm. I have felt not right for around 3 months. I noticed lump 2 weeks ago and have breast clinic appointment on thrus. But, i am worried and anxious about my left arm and how its affected, i assume due to the lump?. It feels really weak and like the muscles are being pulled. Very uncomfortable feeling that i had last week but it cleared after a few hours. But, it came back yesterday and is still there. Anybody else experiance this?