the symptoms you have stated many a times are caused by a peculiar but not uncommon problem called the geographic tongue
. it is called so because the lesions as u have stated look like areas which keep shifting. it is also called burning tongue syndrome
as thats how the tongue feels.
there are lot of theories as to its cause, in which stress
and bad diet and spices are at the top, but there is no definite reason for it. some medicines can also cause it so please check if you have changed or are taking any new medicines.
This problem has only palliative treatment such as:
multi vitamin tablets
avoid spicy food
maintain good oral hygiene
try to reduce stress, anxiety
and get proper sleep hours and eating habits if possible
having more water and ice may reduce your discomfort