I would suggest you get the following investigations like hemoglobin
function test, Vitamin B12
levels, Calcium levels, serum electrolytes and blood sugars done. Sometimes thyroid disorders, calcium/vitamin B12 defeciency,anaemia can present with the symptoms you are currently experiencing. Hence, I feel it would be worthwhile to do the above investigations. Other possibilities I can think of are acidity(gastritis
Hope this helps.
Dr. Divya Kuttikrishnan