Extreme pain in left breast

Hi everyone (31F) just wanted some opinions. I’ve always had painful boobs. Usually just a mild ache that gets slightly worse with my period. I have fibroadenomas in my right breast that are being monitored. Recently I developed an extreme stabbing pain in my left breast. If I walk down steps or put any pressure it hurts to the point I have to sit/brace myself. It’s hard not to vomit from the pain at times. I can’t feel any lumps (although I can’t press too hard). I feel like I’m being dramatic worrying, but has anyone else had this? I have a Mammogram scheduled for next week. I’m sure all will be fine, but still a little anxious lol