The doctors can't figure out what's wrong with my breast

 Hello. I hope it's okay to post here even if not diagnosed. I've been living in fear of IBC for 18 months now.

18 months ago I was breastfeeding and developed redness, swelling and edema in one breast. What they thought were mastitis. I was put on anti-biotics but they didn't help. I had an ultrasound which only showed some edema and skin thickening.

 I was referred to a surgeon, who "watched" me for several months, and the problem slowly got better, both in apperance on on the ultrasound.

In the end he decided to do a biopsy anyway, just in case. It was negative and the surgeon discharged me, saying this was "nothing" and would get better in time.

 The breast remained with a thickened skin at the involved area and slight edema under the nipple.

Several months later the breast swelled up, no redness, just bigger, as if there was more edema. The problem went away after a few days, and was almost gone by the time I had a doctors appointment. I had a mammogram and an ultrasound, which showed nothing. There was still the skin thickning and slight edema.

I was referred to a skin specialist. He put me on skin cream, which did nothing.

Two weeks ago, six months later, and a year and a half after the problem originated, the breast swelled up again. It resolved in ten days. I had ultrasound again, showed nothing. Still slight edema and skin thickening.

I am now waiting for an MRI.

 But last night, I started getting stabbing pain in the breast for the first time and am trying not to panic.

 Is my story anything that sounds familiar? The doctors have no idea what's wrong with me, but they don't seem to take it seriously and sound very sure that this can't be anything because of how long I've had symptoms without them getting worse and for the most getting better.

 Thank you for reading, I appreciate any feedback.