Help!

Ok mamas, this is my second child but I never had this before. My milk came in on Monday (yay right? Wrong!). And since then I have not been able to release the pressure. My boobs have literally doubled in size and the pressure is so severe that I can barely lay down to sleep. I’ve tried hot compress, hot shower, massage, and I’ve started pumping in hopes to release some milk build up. I even have golf ball sized lumps in my armpits. My son is nursing every 2-3 hours during the day, but to add to the pain I have cracked nipples and I am brought to tears every time he nurses. He had a tongue tie revision in the hospital on Sunday so I thought that his latch wouldn’t be a problem 🤷‍♀️. I am worried about mastitis, and I really just need to get my boobs to go the F*** down 🙏🏻. I really don’t want to quit nursing so Any suggestions welcome!