If your MRI and CT are both clean, it would mean you have not had a bleed or other CVA (Cerebral Vascular Accident).

The temporary rise in blood pressure from anger and straining could make your head feel 'full'

Learning to recognize this and respond by calming yourself to lower your blood pressure can be helpful. Having a blood pressure kit at home will allow you to verify this temporary increase in blood pressure.

The injured brain often has a problem controlling blood pressure. The lowered head position will increase BP a bit. Many of us have problems with head lowered positions.

Controlling anger outbursts is important. The propensity to outbursts of people with PCS is common but not impossible to control in most situations.

So, don't worry about having a problem in your brain. Just learn to relax when this happens.

My best to you.