Me, too! I especially can't stand not being able to multi-task. It's also very difficult to have several things going on at once. It begins to feel like brain-overload. My primary doc suggested my strokes may have affected stimulus centers in the brain so that its hard to process over-stimuli. True or not, just hearing that made me feel better because it meant it wasn't my imagination - these things, "effects" or "deficits" were real.
Like you, I definitely had lots of mood swings and a pretty bad case of depression. After suffering with that much too long, I finally got on appropriate anti-depressant medicine in a dosage that really made a difference. Regular docs often don't prescribe high enough doses but psychiatrists should know.
I hope you're able to find the right docs and the right meds to help.
Good luck!