Before you take the propranolol, check your blood pressure. If it is abnormally high, then the propranolol might be worthwhile. Otherwise, I suggest to just go about your day. Maybe some very light neck mobilizations. Nothing extreme.

You both could do some icing. Icing is always a good idea when you have a joint strain. Use warm for muscles. Ice for joints.

And, go on with your life. Not every little sensation needs attention. Find something to be active with and you will forget about these little issues.