Hello dear
I understand your concern
Your symptoms could be due to 
diabetes.
To diagnose diabetes melitus FBS should be greater than =>126 mg/dl on two different occasion.
Your FBS 115 mg/dl value suggests impaired fasting 
glycemia.
I would suggest to go for post meal blood sugar and 
HBA1c test to confirm about the diabetes.
Meanwhile 
Take healthy diet, more green leafy vegetables and fresh fruits
Drink plenty of water, do regular exercise like walking, running and 
yoga.
Avoid excessive sweet in the diet.
Take small frequent meal rather than large meal
You can take neurovit tablet.
Other management will depend on the test result.
Hope this may help you
Contact HCM for further health query
Best regards
Dr. Sagar