Hi, I've been given antibiotics for a breast infection but I wasn't told what kind of infection, I haven't had any kids etc so I'm doubtful it's mastitis? My only symptoms are pain and i can feel lumps...it's not hot or swollen on the outside!

The gp said she could feel a long swollen tube. I've read up about infections you can get when you haven't had kids/breastfeeding but there's too much info and it's confusing me. I'm on the last day of antibiotics and I'm still feeling pain and now I have a pain sensation in my nipple that I didn't before? I'm starting to get worried because I've had the pain for months it was only by chance she felt inflammation when I went in. 
could it be a deep abscess that needs draining? 
I'm driving myself mad! Thinking the worse!

any help or advice please! 
 

Hollie