hi and welcome,
Numbess in the palate
, tongue and lip may be caused due to some trauma , it may be physical trauma to the oral tissues or chemical trauma by certain food products and the allergies.
This feeling can be psychological due to anxiety
factor. left over foods consumption will not have any harmful effects over the oral mucosa
Headache can be related to physical or mental stress
, you can have analgesics to relive the pain .
If the pain doesnt subside with analgesics , you need to consult a physician and get the evaluation done.
i hope this helps ,