This sounds like a mouth thrust infection or even tonsilitis. You will need to see your doctor to be certain and to have some antibiotics to clear this up. A swab test may need to be done to examine the bacteria on your tongue. Good luck.
I think the white coating on the tongue is normal bcoz I hav it and so do other ppl, the red blisters on the other hand maybe sumthing! are these big or small? and are they all ova ur tongue? if u look close at ur tongue u hav lil lumps and bumps, maybe red due to tongue colour, these are taste buds! if u dn't think it is this then go get it checked out!