Blood in Saliva every morning. Gums.

I have found blood in my saliva every morning after waking up or even after having some hot food, this has been happening for last one month. I have no previous history of any problems or medications. The quantity of blood is minimal and comes on for 2-3 spits and then vanishes may 3-4 times a week. I found there are red bumps on my tongue which have been causing this and ignored it. Now lately, i have been finding this regularly may 6-7 times a week. From last 2 days, i am also having stomach burn and some digestive problem as i feel like vomiting after having food. I am healthy person a bit overweight but not obese to my height. Unable to diagnose actual cause and which specialist to prefer. I also have gingivitis problem with bleeding gums.