You may want to check into cubital or orbital tunnel syndrome as it seems that your nerves may be affected if you get a weakening in your grip when your forearms are extended and elbows bent as in writing or typing. It is important to know if this is a nerve problem before going to the point where the nerves are damaged more severely. It would be of concern to avoid writing or such exercise that may cause the forearm to be contracted or not fully extended.

Aye

Hi I just got your email, so I will just answer here since I see you.
Here is a link to the Sivanandayogavedantacenter in your area click on the OM in the circle of unity contained within the triangle which is not fully contained within the box, yet all of which is joined in a large circle of unity anyway..

http://www.sivananda.org/ny/index.htm

they hold free lectures,workshops, yoga classes, and vegetarian meals YUM!
they may be able to better assist with therapists or practicioners for your condition since I am not in that area. Not only is a proper diagnosis important when dealing with the nerves it must be adressed properly with treatment that does not necessarily include a risky surgery.

A>

PS for hands and forearms- and this one can hurt some so test how much weight you want to put on your wrists:

down on all fours, knees directly under the hips and wrists directly under the shoulders- flat back

From this position lift hans breifly and slid them under you so your fingers are facing towards your kenees and your palms are facing upwards- this stretches your wrists out and the upper inside of you forarm
Perfect for writes cramp-
Hodl with full upper body weight or as much pressure as is comfortable

repeat 3 times and hold for 45 sec to a minute each time..