“What are the psychological effects of a stroke?”

It depends what part of the brain was affected by the stroke but anger issues and depression.

Stroke is a devastating illness. It deprives you of things that you are used to doing and take for granted. Your speech may be impaired; your mobility may be impaired. As a result of this disability as you probably guess already, patients get depressed. Depression is a major psychological after effect of stroke. With that said, it is treatable by seeing your internist.
Good luck!

View these links...
https://www.stroke.org.uk/sites/default/files/feeling_overwhelmed_final_web_0.pdf
or
https://www.memorialmedical.com/services/stroke-services/what-stroke-means/effects-of-stroke/mental-changes