Breast pain.

So I have a two year old and stopped breastfeeding when he was 18 months. Here and there I'd notice I'd leak milk but not too much. 3 weeks ago I had breast pain that I've never felt before under my breast. It is constant. I woke up one morning and I was just getting dressed and a noticed a clear discharge. It wasn't white. So I made an appointment. He said it felt tender and that he isn't so concerned but to get an ultrasound.  I had stabbing pain so they made it quicker for me to get it. The first thing the ultrasound tech said was it looks really swollen. And when I got my result, they said they didn't see anything and it could be a vien and they felt again and said they felt a lump but it should go away in 2 days. So I already had medicine so I waited. It still was constantly hurting. So I went to another doctor and he was shocked it still hurt and felt a lump but wanted to rule out an infection (mastitis) and then said to go back in 2 weeks whether it was still hurting or not. Has anyone had experience with this ? And these pills make me so nauseous and sensitive to light which they said it would do but it's just so horrible.