you might be suffering from migraine
by the way you are experiencing the symptoms
the antibiotics that you have been prescribed could have been strong causing your acidity levels to go up causing you to have nausea
and heart beat fasting.
itself and anxiety
can make you feel what you are feeling.
i would suggest you get your self reviewed again by the physician to rule out the causes i have mentioned above
hope to have answered your query
get well soon.