Pain at side of chest/breast

Hi

I have been having a pain in my left armpit/ breast for some time now, doc said was hormonal but I get it at times when it’s not cycle related. 

It worries me that’s it’s chest and some times so bad I’m clutching my boob/ armpit 

Any ideas?

Do you have any other symptoms? Palpitations? Sweating? Shivering?