Tongue problems. Worried is it a cancer?

Hi I got my wisdom tooth so Dr prescribed antibiotics and painkillers after that I got white ulcers on tongue and lite pink pimples back of my tongue.. Was very painful so I went again to the same dentist he prescribed b complex and quadrajel after pain r gone and white stuff went and again came back.. Then again I went to ent she had given some acidity and again bcomplex with probiotics. Pain is not there but dry mouth and again sometime disturbance.. Am so worried.. But drs are telling everything is normal.. Am worried is it a cancer? Bit drs are telling this is normal.. Don't look ur tongue... This not cancer.. It's from last 20 days.. Am diabetic too.. And I went to my endocrinologist checked all my blood and X-ray everything is normal.. She also told tongue is normal.. No worries.. But when it will go completely that white pimples and red one inside. .again am going to general practitioner next week. Please help am very much worried..