So my son has had this cough for more than a month now. I took him to the doctor & she said that he…

So my son has had this cough for more than a month now. I took him to the doctor & she said that he was fine as long as he's not working too hard to breathe or has a temperature. When I came home from work my mom told me that he was a little flush, gagged when he ate food & didn't want to drink his milk. Sooooo what does that mean? I don't want to waste another $25 for the doctor to tell me he's "fine". Also, he kinda warm when I touch his forehead. Help please!