pass your breasts are clearly gearing up, which explains the damp top, plus your lady bits are doing the same. I have been experiencing an alarming amount of moisture, and it is not wee or sweat, but not in large enough amounts to be my waters. If it were your waters, the bed would likely be wet, and moving around, especially getting up would result in a gush, maybe big, maybe small, but you would know it was a gush.
evil make sure you put cream on your nipples as you need to protect them now they are sore. Lanisoh is good. After each feed. No need to wash off before feeding. The odd bit of formula will not hurt, but do persevere with feeding. It is normal for bf babies to be like he was last night. It can be pretty constant, especially late afternoons and evenings. Make sure he is on the breast as much as you can tolerate. Even if he is not getting milk through, he is stimulating your breasts to produce more. It is frustrating for him, and distressing for you, but you will get there. I personally wake my babies if they have not fed for 3 hours. DD2 slept for 10 hours the night after she was born, and I had asked the MWs to wake me and her, but they did not. I was so angry as it put us back considerably. If there is a bottle to be given, try to get DH to give it. Baby needs to associate you with milk, as a bottle is easier for him. He needs to work hard for your milk. You are doing so well, and every drop he gets is priceless, but if it is too much for you remember it is your choice. Take one feed at a time. Even though I was an experienced feeder when DD2 came along, there were times I wanted to give up, and was in tears, but I kept at it. Feeding a 10lb baby has its challenges!