are you still there?
please type and hit repy
I understand your concern
lisinopril is usually started out at 10-20 mg and then titrated up to 40mg
but if you are having symptoms 30 minutes after the medication, it is possible that it is too high for you
as long as you are not having chest pain, shortness of breath or lightheadedness at other times, I think that you can wait to see your doctor on monday
but if you do have other concerning symptoms, then you do need to go to the ER :-)