Side effects of propranolol include abdominal cramps, diarrhea, constipation, fatigue, insomnia, nausea, depression,
memory loss, fever, lightheadedness, slow heart rate, low blood pressure, cold extremities, sore throat, and shortness of breath( ref: http://www.medicinenet.com/propranolol/page2.htm). It is possible that your symptoms are related to the medication you are taking. If it is necessary to discontinue propranolol, its dosage should be reduced gradually over several weeks.