Breast pain is worsened by stress/anxiety... If you have been checked by the doctor already I'm sure it's nothing to worry about. It sounds as it you already know what is causing this but it's hard to think straight when you are feeling scared.
I ended up going to a specialist breast cancer clinic because I had pain and could feel a lump (my doctor couldn't feel anything but sent me to be safe).
The consultant at the clinic said she sees lots of women with pain that is caused by anxiety.
The lump was just a small harmless cyst that showed up on ultrasound scan by the way
---------- Post added at 21:29 ---------- Previous post was at 21:26 ----------
Meant to say try not to worry as it all sounds like you're fine.
If you are still not happy just go back to your doctor next week. It's what they are there for and no doctor will ever mind you wanting to double check your breast health.
Happy New Year!