Help !!!

Okay so were in the process of weaning our little guy , and drying up my milk . Is there anyway to do so without risking mastasis ! I'm wanting to quit cold turkey , no other way has helped ! Last night , we'll starting yesterday I noticed my left boy was swollen and red at the nipple . I was extreamly engorged . So I ended up nursing to express some milk . My breast felt like it was on fire so in fear that  it was mastasis i let LO nurse on that side all night ! Today it's seems to be better ! Still a little tender , but not red and swollen as much!! How do I dry up my milk without risking this ?