For how long you took this medicine?
Stop it immediately if you are having heart palpitations.
HALF KNOWLEDGE IS WORSE THAN IGNORANCE.
You read it somewhere that conium is a kind of poison and now you are having anxiety .
No it's not like that , you have taken potency 30c and it can not have such toxic effects.
But it clearly means
* Either you are suffering from ANXIETY symptoms, knowing you have consumed some poison
* Or you have taken medicine in a very wrong manner
Next Steps
to clarify all doubts , and know your correct medicine always consult with trained professionals.
Health Tips
yes there are homeo meds which can easily reverse your symptoms.