yes this could be oral thrush
Recurrent fungal infection
you must get yourself tested for diabetes
by getting blood sugar tested.
For oral thrush you should consult ENT specialist
you can start with--
this is a gargle you will have to mix all three and then do it--
Liq. Lignocaine 1 bottle + Tab. Betnesol 4 tablets + Clotrin mouth wash, mix all three and then do gargle 3 times a day
Betadine gargle 2 tsf in half glass of water three times a day
for starting oral antifungals do consult your doctor.