I've seen my doctor for this once before over a year ago and he gave me steroid cream. It didn't help any. This time when I came back he recommended circumcision because the one cream he gave me didn't help.
If your doctor won't accept that you want more steroid cream so that you can use it in association with stretching exercises, then the only alternative I can suggest is that you look for another doctor who will comply with your wishes. I don't suggest that you try to find non-medical sources for the cream as it is a powerful medication and needs to be applied strictly under a doctor's supervision.
In the meantime, you could do the stretching exercises as described in the Men's Health Message Board sticky without steroid cream. Those exercises have helped many guys achieve loose foreskins.