Pins and needles in your fingers might be poor circulation, I had that for a few weeks but it disappeared a couple of weeks ago. Just do finger stretching exercises (although not in public like me, I realised it looked like I was playing with invisible boobies - cue red face!) as often as you can.
The stairs are the worst thing aren't they? I find going down ok but going up I have to take them one by one, making sure I have both feet on the ground before I put any weight down. As in, don't go 'right foot first step, left foot second step', go 'right foot first step, left foot first step, right foot second step, left foot second step'. Takes forever but helps reduce the pain xx