Hey,
I've never taken it myself, but i've had a couple of patients who have experienced similar things.
The reason is inpart because propranolol is lipid soluble, meaning that it can get across the blood brain barrier, and therefore affect the brain. If it's really bothering you there are other beta-blockers (the class of medications that propranolol is part of) that are not able to cross the blood-brain-barrier that shouldn't have the side effects you've described.
If it's bothering you talk to your doctor about it, they will be better able to assess the risk/benefit of each of the medications and what will work best for you :)
xx
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