Breast pain is my overriding perimenopause problem. It fuels my anxiety which then makes me worry about my boobs all the time.
Anyway, on to the breast discomfort itself: mine is three weeks out of four. Hot and sore and tender and heavy and lumpy. Radiates out to my armpits.
What helps? I wear a bra 24/7. I take starflower/borage oil every day (Holland and Barrett is the best I think). I get them checked at least once a year to try to help with the anxiety (examination and ultrasound).
Regarding deodorants/anti perspirants: I have used Mitchum for 20 years. Love it. But decided to try Bionsen this year. Did not work at all - gave me sweaty, acidy armpits. Yuck.
My books say avocado and bananas help. No idea whether they help but I try and eat them a lot. Might cut out the middle (wo)man and start smearing them over the boobs and armpits to see if it helps. A natural fruit deodorant
Without sounding weird, I have big boobs and wonder if it might help if they were smaller.
No joke - sometimes it is so bad I have thought about asking for a mastectomy.
Regarding bras: M and S cross your heart firm support best in my opinion.