With regard to nasal spray- buy a saline solution rather than a medicated kind. I had a cold years ago and actually got hooked on one- I had to keep spraying & spraying to even breathe! Then I switched to a saline type and got better. So be careful never to use too much or too often.
Nose spray and heat will usually help. Do not constantly blow it, because that just swells up the inner tissues and makes it worse. Get some nose spray from Walgreens or somewhere, and don't blow it all the time. Warm water does help.