Breastfeeding infection ?

Sorry if this is tmi, but has anyone gotten a breastfeeding infection after having their baby? My baby is 5 weeks old and yesterday I randomly came down with a fever, chills, shaking, dizziness, nausea, and my left boob felt horrible - super hard and painful to be touched. I go from being freezing and can’t stop shaking to burning up. I googled it and the symptoms seemed to match a breastfeeding infection, and read that I should keep pumping it until it’s empty and it might go away on it’s own, and it’s a bit softer but all the other symptoms are still here. It’s been maybe 18 hours. I have my 6 week appointment later this week - should I wait until my appointment or is it urgent that I go in sooner? Is there anyway to help with the symptoms? I’m really worried about losing my balance or passing out while taking care of the baby.