Hi Charlotte, yes I’ve had all sorts of sensations in mine from quick sharp stabbing pains to a tickling sensation. I believe it’s normal and is the nerves firing back up as they heal.
Well done on returning to work! I started 3 hrs/day 2 weeks ago (so 2 weeks post op#2) and am now on 5 hrs/day so gently does it, and I’m WFH til end August. It is tiring but, as you say, it’s great to be back. I lead a fabulous team and everyone’s been very supportive. It’s been really helpful to have this distraction from a mental health perspective as it takes my mind off #%+# cancer for that time and I feel a bit more ‘normal’ (whatever that is!).
Hope you enjoy your new liberated ablutions all 
and I wish you all non-pongy armpits 
Bx