Hi welcome to Health care magic forum.
Thanks for choosing H.C.M.F.
Your stomach pain started as a hungry first, then it descended to the belly button, then to the left side of your stomach, as i under stood it is the upper left side of abdomen.
All this suggest the gastric irritation due to spicy food, or peptic ulcer
, or may be the worms in the intestines.
I advise you to consult a surgeon for diagnosis and treatment. You may need to have gastroscopy besides other routine tests for confermation. in the mean while you can use bland diet with bread, milk, curd, etc to avoid gastric irritation.
Wishing for a quick and complete recovery.