Sorry to hear that your little guy is sick! It is the most helpless feeling as a Mom!
Sounds like you are doing everything you should be. THe only thing I have a little concern over is that you turned up your heat. I learned the hard way YEARS ago with my now 19 year old that the heat turned up and wrapping him in blankets and having him in warm jammies was the worst thing I could have done for him.We ended up in the ER with a 105 fever. But, I figured he was cold since he was sick so turned up the heat and when he was sleeping I put him in warmer jammies and blankets. By doing this I was making him warmer and his fever increased since the body heat was not able to escape as it should. From that point on I actually turned down the heat when anyone is sick in our house and only if I see shivering do I turn it up. Make sure that you are comfortable and as long as you are then so will your son be!
One other thing I would like to suggest is that if your son is not feeding as often make sure that you are pumping to keep up your supply! Also, congrats on making the decision to BF... I think that is great of you!
Hope he feels better soon! Many blessings to you both!