Hi - I had all what you describe over a period of about 3 years including where fingers were unable to turn more than a couple of pages of a newspaper. At worst I was no longer able to tune my guitar or strum it for longer than 15 seconds. Plucking was out of the question as it fatigued the whole hand immediately. Trying to pull one small weed between finger and thumb would also fatigue the whole hand - and then the neck, legs, trunk muscles would all crash just moments after. I had trouble zipping up my own jacket and taking things in and out of my pockets. I could type only one sentence on a computer before fingers, hands and arms lost their strength. The doctor questioned if I liked my job or not. At least luckily my employers were a little smarter and made things as easy as possible for me at the workplace.

The hardest action of all was to have to stretch anything using the hands and with arms away from the body - What a nightmare.

Hopefully you get your results soon and that the treatment helps