All I can say is take this seriously because any probs with feet and diabetes need sorting out quickly, if the doc thinks it’s an infection has he given you any antibiotics?
It well known here about my problems with foot and legs or rather lack of them , and I’m not saying this is always the end result ! It took me nearly 30 years of really dreadful blood sugar control to get where I am today ,
All I will say is keep pestering the” powers that be “ to get the treatment you need . You can certainly help the situation by trying to keep blood sugars within range as much as is possible , elevated sugars are normally a good indication of an infection .if at all possible an appointment with the podiatrist might be a good idea.
I hope all goes well with x rays and blood tests