In need of some advice please!!

I’m a couple of days late on my period so naturally I took a test first thing this morning. Negative. I’m showing all the signs: tiredness, nausea, going off foods. My main symptom is pain in my boobs. Now, I usually am a little tender around this time but this month I’m in absolute agony. I can’t sleep, I feel like someone is piercing my boob with a hot iron rod whilst clamping down on my nipple 😢 when I was 17 I had a scan on my breast and they found I had Fibroadenomas. This has doubled in size and has been causing my so much grief over the last 3 days. The pain is not going away. Please can someone advise why this would happen when it hasn’t caused me any issues my entire life????