My husband has had one episode of acute body trembling and it was attributed to a complete loss of urination for some hours because of an engrossed prostate. That problem was solved, and he was recovering nicely when today he had a similar event with shaking, feeling cold, etc. He went to bed and I kept him warm and the seizure stopped after a while. However, there was no problem with his urination which has been working well, even after the catheter was removed some 10 days ago. What can be the reason for this event? He is not taking any medication and in general is in good health.