Nausea, stomach twisting, then a rosey colored saliva. Once in awhile a sensation in my stomach wakes me up at night. My stomach slowly twists as I feel a funny sensation coming up to my throat. almost as if I want to throw up. I don't actually throw up but my mouth fills with Saliva and when I spit it out it has a rosey color to it and a foul smell. It sits at the top of my throat as if I should throw up and then it passes. It lasts maybe 15 seconds or so. I am figuring it may be coming from my stomach. Could it be acid or even an upset stomach.