History of repeated attacks of DKA and your current symtoms clearly suggest that you are not taking proper care of your sugar levels with the result your diabetes
remain uncontrolled most of times.
These symptoms of soreness in your feet suggest development of diabetic peripheral neuropathy
However you must consult your doctor and get your problem diagnosed.
It can be controlled by appropriate medications but the larger picture is that you have developed this peripheral neuropathy symptoms very early in your life.
This gives rise to the fear of development of other micro vascular comlications like diabetic retinopathy
and diabetic nephropathy
It is warning to you that you should control your blood sugar levels meticulously and for this you have to take your medications properly and also observe strict dietary restrictions and precautions along with regular aerobic exercises
I hope it helps.