Is it red? Lots of water, ibuprofen, cold or warm compress and feed as much as possible on that side. I had mastitis and only realised once I got flu symptoms. Felt immediately better once I started taking antibiotics though x
I ended up in hospital for 3 days on a IV Drip, the dr gave me antibiotics and then a lump appeared and my boob was so hard, keep feeding on both sides, cold compress don’t put heat on it, only express when your boobs are full and not to hard, I hope you are okay and it clears up 🙏🏼
I had mastitis last weekend and it was awful! Not so much my boob being sore but more the flu like symptoms that came with it. I did what you did- hot shower, massaging and continuing to feed, although I phoned out of hours as I didn’t want to wait for the GP to open again on Monday. I know the doctors will be open again tomorrow but you might want to consider out of hours as it can escalate quickly. Ibuprofen is your friend also!