Suggest Treatment For Breast Pain And Swelling

Question : Hi, I have had breast pain and swelling for months, I figured it was a menopause or hormone thing, due to my hysterectomy 8yrs ago. The pain and swelling have worsened over then past month and I recently notice my left breast, above my breast, (almost to my shoulder blade), armpit and arm swollen, warm (inflamed) and sore, what could it be or what should I do?

So, I ended up in emerge that night with swelling, numbness, pain, and itching throughout my WHOLE left side. ( I also feel very hot, like I'm over heating but without the fever, I did mention the menopause concern but he said nothing was wrong) Most of the pain and swelling was under my left breast and armpit. When I arrived my blood pressure was through the roof and my heart was beating very fast. The doctor did blood work, x-rays and an ecg. He said he couldn't find anything wrong, but gave me a referral to the Breast Diagnostic Unit for a full examine. Yesterday, I rested and took some Naproxen, I feel better today but I obviously am still very concerned and scared. I also got no explanation for the swelling, I really don't understand.....if it is "something" in my breast, would that explain the swelling throughout the left side of my face, down to my legs? He also kept asking about blood clots, but I've never had one, although it does sound more like a circulation problem, but again...how would I know the symptoms?
I'm very confused and scared :(