Be careful with that, Pianistimo. I produced a similar effect from using certain training apparatus. I don't know enough anatomy to be certain about nerves under the arms, but I found out the hard way that the palms of the hands are particularly vulnerable to pressure of this type. You aren't taking too much weight on the little finger side of your palm holding the crutch are you ? Cyclists sometimes get that from leaning on drop handlebars. Maybe you could make pads for yourself to cushion pressure points.
I remember my teacher at university discussing about giving concerts away from home. Often pianists will have a long flight to the destination and only a short time before their concert. She said it is important to learn how to play "cold" and adapt to situations where only a little warm up time is possible.
thanks again, ted, for the good ideas. i think i will try it because tonight my rh side of hand and pinky is still tingly (despite the avoidance of putting too much pressure on that side of the palm).
my mum has finally letting me in look into studying singing at music instead of Engineering next year so i hope i can concentrate all my efforts into music which is all i actually want to do. they are not forcing me to do engineering, but the say (which i know) that doing a music degree can end you up with a mediocre pay. i think piano is even riskier than singing in terms of finding a job, but i hope to become a singer and i am finally getting through to my parents. what ever happens, the exams that im doing this year im giving my all.