Breast pain and underarm pain

I have been through the menopause and have not had a period for well over 18 months now. I have not needed to have any form of HRT and have had no real problems. I have developed shooting pains in my breasts and underarms and my breasts feel really tender all the time and painful to touch.Almost like severe bruising as if I have been punched repeatedly in them.( I haven't )

They are also extremely itchy and hot inside and I feel like I have a fever or shivery intermittently. The pain is now severe and I cannot bear anything touching them. Even my arms resting on them is agony. I am 53 and am very overweight.

Can anyone advise me on this as I am very worried?