Injured My Foot 2. 1/2 Months Ago Missed A Step

Injured my foot 2. 1/2 months ago missed a step rolled my left foot. Couldn't walk on it for days Doc appt at time showed no fractures. Was told to RICE it as much as possible. Finally last week went to podiatrist who found that navicular bone was chipped and possibly causing problems with the PTT ( weakness, arch pain and leg spasms) Doc put me in air cast for 3 weeks then wants me to come back in to check if surgery is necessary to take chipped bone out and fix tendon. Couple of questions: in your opinion after having no air cast for 2 1/2 months will 3 weeks really do much? Wearing the air sat has caused even more pain, swelling , numbness and leg spams....why and what can I do?( I've adjusted the air quite a few times to see if this would get better...no luck)

Sorry for long story and questions. Appreciate your time and help.

K8