These details are insufficient to diagnose a Garavisha or slow poison in food...
But the above symptoms are not negligible.
Next Steps
How to differentiate?
If finely observed food colour and tastes are altered if poisoned... and overnight or after few hrs. food shows different colours on it...
can be confirmed by this..
not a poisoned food but spicy sour previous day food fermented food also does same effect on body...as you mentioned...
Health Tips
What ever may be
add 2 or 3 tsp of melted ghee on every food time ...ghee is the best anti poisonous and the best rejuvenating food... and it is a medicine too...