the cut at the base of your tongue is due to injury
caused by a crispy potato chip which you told is regular part of your daily diet.
until you shift to a healthier diet the cuts and ulcers will keep appearing. drinking carbonated drinks which are diuretics( meaning they lead to loss of precious water from body) is making the production of saliva less which in turn making your mouth dry and smelly.
as such you dont seem to have any cancer symptoms
eventually gonna predispose you towards it.
see a dentist
as soon as possible and in the mean while you should
start drinking water
avoid hard and soft drinks
shift to balanced diet
take cap doxycycline 500 mg 2 times a day for three days
tab orthodex 2 times a day for 3 days