What Causes Tremors In The Hands?

I m 72, 170 pd. Tremors are at times over the whole body, but are most bothersome when they effect my hands, and therefore my typing – even though my keyboard has a device to help steady my hands. Tremors have been with me since my stroke in September 1990. Since 93 they have been treated by Neurontin. which seemed to ease matters a bit. They seem worse of late. This may be because the medication is less effective after all these years. Also since moving to this group home – after a major operation (which left me minus some cancer, and plus a colostomy bag) and three months-plus recovery, I ve been fed here rather than feeding myself, as I ve been doing for years. That lack of activity (though seemingly slight) may heighten my tremor sensitivity. Anyway I wish that they were less bothersome. Any recommendations? Pete Donhowe