What Could Weak Arms With Curled Fingers While Having Cerebral Palsy Mean?

I have right upper motor neurone syndrome, mild form of cerebral palsy. This is what the neurologist diagnosed me with 10 years ago. I m 30 years old and have had problems throughout childhood but was only officially diagnosed at 21 years old. My right arm and hand are affected, although I have had no problems with my legs, the right leg is also weaker. Recently my arm became very weak and I loss control of it, it went blue and for 1 hr my arm was numb. The next day my fingers had curled into the palm of my hand and I could not move them. I am waiting to see a neurologist and have had a normal ct scan. My fingers have uncurled now but my hand and arm are very weak still. This happened 3 weeks ago. I cannot drive at the moment, my arm feels heavy and I have difficulty typing (admin work is my speciality). Please do you have any ideas as to what has happened to me? My frame of mind is not too good as I am frustrated at what I cannot do now and how long it is taking to get better. I am well known amongst friends as having a great memory but recently there have been a few occasions where they tell me I have done something or said something but I cannot remember doing this. I m 5 ft 6, 7 stone 5, and I have pernicious anaemia too. Any reply greatly received, many thanks, Greta Hooper