Hi mam        cracked tongue  may be due to vitamin deficiency(biotin,vit B12), it may be of geagraphic tongue(multiple areas of depapillation in tongue),fungal infection( oral thrush),trauma from chipped tooth,or other sharp objects.traumatic brushing.....          you might get the symptoms of pain and burning sensation.....aggrevated during taking spicy foods...         

Your description sounds like a fissured tongue. This is variation of normal found in some people.

Might b it is geographic tongue. No issues u have to refee to a good Oral surgeon who can help u in diagnosing the same and start with its treatment. Stop taking spicy food