Breastfeeding help

So I’m 35 weeks this week & my milk just came in this evening!! My boobs are killing me so I took a hot shower but what else besides Tylenol can I do? Should I pump and save for baby? I do have preeclampsia so baby can come any day now. I just don’t want to leak and waste my milk or my body get the idea we aren’t using it and stop producing (if that’s even how that works). I struggled so hard BF before I just want to do it right this time. Any advice??