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You may have developed an allergic reaction to the propranolol which has caused skin eruptions as well as making you feel abnormal.
You should get to ER if you have any trouble breathing or if you face is swelling or is getting swollen as that may interfere with breathing.
If you have normal breathing without any face swelling you should take an anti allergic like Benadryl or cetrizine to counteract allergy.
I would be happy to assist if you need any further assistance in the matter.