Breast shrinking! HELP!

Hi! I'm not sure if I should post here or if this is for people diagnosed with ILC but was hoping for some insight.

My story starts in the beginning of July. I started having a feeling of "let down" in my left breast, like when you breastfeed. I haven't breastfeed in over 4 years, but the feeling was so distinct and so strong I swore I would be leaking when I check but to my surprise nothing. This kept happening over the weeks to come and eventually started happening everyday. I had an annual appointment coming up so I figured I would just bring it up then. In the time before my appointment the left breast started to shrink and ache. When I saw my OBGYN she told me it could all be hormonal and go just watch it and if any changes let her know. I felt I was brushed off about the shrinkage.

I waited a whole month. I paid close attention and tracked the symptoms along with the menstrual cycle and noticed it was not related. On Monday Oct. 9th I called my OBGYN because I woke up and my left breast had a burning sensation and I had pain and burning in my underarm. The burning felt like it was coming from the inside. No swelling. No redness. At this point I felt my breast had shrunk a little more since I had last saw her. I got an appointment that afternoon. When I saw her she referred me to a Breast Cancer specialist the following Tuesday Oct. 16. In the week I waited my left breast continued to shrink and I had changes to my nipple. On the Monday before I went the specialist I had some thick yellow discharge and lots of burning.

When I saw the specialist she did a mammogram and ultrasound and told me I have Dutal Ectasia and Intraductual Papilloma. We talked about surgery to remove the obstructed duct but she thinks I should wait and go back 3 months. She also dismissed my concern on the breast shrinking just said that "everyone has one breast bigger than the other" which I am aware of, but this is completely different. This is a significant change in size. She never addressed the burning and only said that's why I feel the "let down" sensation.

After coming back to the office I work at the doctor here asked how it went and when I told him he said I should had an MRI and Biopsy.

I am only 25. My question is should o have the MRI done? Could this just be what the specialist said or could it be more?