Re: I need advice please.
Did you talk to a doctor to get the air cast after having the bone scan? If so, talk to them or their nurse to get these questions answered as none of us have seen your scans to be able to properly advise you on this. If you haven't seen a doctor, it would be wise to do so.
If properly treated, fractures can heal in 4-10 weeks, so you're not in a situation where this will go on long term. It's better to follow a doctor's orders now and get it healed properly than to have further complications down the road from not treating it properly right now.
I feel for you about it being your right foot! Some others on here may be able to give you some suggestions about that, and I know some people on here have posted about driving left footed.