I have some numbness from my hip to toe the entire length of my left side - and this is from extended nerve compression before my lami in 2001!
So, yours may very well be temporary - but, it also could be long lasting
luckily maybe you'll get by with only the area you mentioned.
I admire you trying to return to work - I was no where near ready @ 4 weeks. I certainly don't think it's unreasonable to extend your recovery time, all of us are different and you must listen to your body it will let you know.
Are you on anything for the spasms?
your right, the mental part is the hardest!
and take it easy - let things heal properly and think positive