A friend of mine who, like yourself, was recently circumcised for phimosis also experienced the same problem, with over-sensitivity and irritation of the glans.
He tried a number of different pain-killers, loose shorts, etc. and nothing seemed to work.
What he did try, however, was using a condom.
I know this sounds unorthodox (and believe me, his urologist was completely over-whelmed with amusement upon hearing this); the fact that the glans was covered for most of the day (save for urinating), allowed his penis the opportunity it needed to heal.
Six weeks later, he is slowly resuming sexual activity, albeit just masturbating for now.
If you were wondering how to keep a condom on the penis, while flaccid, just use some surgical Micropore tape to secure the rubber to the base of your shaft.