antidote?

when you're having a fever,
there's medicine to consume orally.
if its too high,
there's a jab to drop the temperature.

when you're injured,
there's 'burno' or 'iodine'.
if its too deep,
doctors can stitch it up.

when you're lovesick,
there're letters to reminisce.
if its too forlorn,
there's always a phone to connect to.

but when you're tired,
when sleep can no longer satisfy.
or when you're tired mentally and spiritually,
esp when you don't know what's wrong.

is there an antidote, cure or medication?
is there any ways or means to heal?
even if there're no cure,
surely there must be something to make you feel better.

where is it?