Shooting electric type pain and pinching pain in breast

I’m hoping someone has experienced similar feelings and may be able to shed some light. 

Last month I was getting shooting electric shock type pains in one breast.  They would happen several times a day, last for a second or two and startle me each time.  They don’t appear to be cycle related.  

I went to my GP who did a breast exam and couldn’t feel any lumps so sent me away. 

The shooting pains have gone now, but instead I’m getting a pinching pain in the same breast.  Usually happens if I bend over to pick something up, if I stretch my arms up or if I lean a certain way.  Again they don’t appear to be related to my cycle and feel like it’s just behind the nipple.  

Has anyone had anything similar?

I should add that I’m 45 and not on any form of birth control.