I apologize for a delayed answer.
There can be 2 major causes for these type of symptoms -
1) Stress related, 2) Stroke Related.
1) Stress Related - He may be under stress due to Official pressures/ Personal reasons or maybe due to his present symptoms, which is leading into a vicious cycle. The more he thinks, the more stressful it becomes for him and results into his cutoff from the external environment (social nature).
2) Stroke Related - Which can be recognized by scanning only (MRI / CT scan). So it's very much advisable for you to convince him for a scan of the head / brain. However if the scan results are normal then we really need to plan the further course of action very meticulously.
The second part of your doubt was to know the residual side effects of para embolic stroke.
I would like to tell you that in stroke, we get to see the symptoms clearly and the treatment is aimed at the control of the symptoms. Whatever is not controlled via treatment is the "Residue" of the stroke.
SO i don't think presently i should comment on the same and can give you inputs, only after the scan results are in front of us, to determine the further course of action.
Feel free to discuss more.