Hello, thanks for the query to H.C.M. Forum
Ivy poison is a toxic poison developing dermatitis
like conditions in skin with hay fever
As rashes spread due to contact , when these rashes begin in body than antigen- antibody reactions starts to counter the poison effects same thing happened to you.
Last time it was somewhat in mild form.
This time this is in severe form , hence rashes spreading over all over body ant in that circumstances definitely heart rate
Now only way is to consult a physician and get in blood examination to find out percentage of eiosinophils in blood. Have a treatment of allergy
Regards. Dr. HET