Is this due to stress?

Hello I've had a stressful week at work. I've noticed when I'm feeling stressed i get a sore tongue. Its very pink and sore at the tip to near the middle.I then get a white thin layer from the sore pink bit to all the way to the back.I told the Dr she told me i could me anemic,i couldn't show her as it cleared up. I got tested and i wasn't anemic. It comes and goes. This is the first time this year ive had but have suffered bad in the past where I would get it then as it cleared up I would get it again. I have thought its thrush but didn't think you'd get thrush for being stressed. Please help. I will go to the doctors if it last a while.but just wondering if anyone else suffers this.I also suffer from ulsers.