Very worried about ? Inflammatory breast cancer

Hello

I am a 38 Yr old female who had a full hysterectomy last year and have been on hrt for surgical menopause. Ive had some discomfort in my left breast for about a month, I wouldn't say pain just feels strange - feels like sunburn around the nipple/behind the Nipple, some pressure/pulling inside the breast and near armpit. Ive just had a rash come up today. Going to go to gp tomorrow but worried. I don't know what the point is of this post but I guess just needed to get it out of my head! Thank you.