I completely know what you are going through! I was right where you are only a few short weeks ago. What worked best for the painful and sore nipples was no creams and just wearing a t-shirt, no bra, no pads, no nothing. It was a little gross, and certainly wet, but my nipples felt so much better after a few days! Let me tell you, I went through so many shirts that I had to dig into my husband's as well.
Eventually I could manage a bra and some good pads or a big beach towel at night to protect our sheets and mattress. I really like Lansinoh's Extra Soft nursing pads. Make sure you have a bra that can be comfortable even when you are engorged. Mine were too tight and that caused extra pain for my nipples and the pressure was awful.
Hope this helps!! Your body will chill out soon and it will all be so much better!!