Had this foot drop for about 5 years and as Carole says your front toes catch the floor when you walk.
It is just my left leg and when you look at the bottom of my shoe it is badly worn under my big toe, in fact I have worn out several shoes like this over the years.
I have never fallen with it fortunately, as I always look at the floor when walking.
Bought all the aids to lift up my foot but no real success.
Neuro phsio did help me with the NHS for 12 weeks but then had to go private and after forking out a small fortune for 2 years, stop it off last month.
Read you struggle after 10 minuted walking that is about half a mile, when I could walk a bit used to stop every few hundred yards and have a sit down on a bench or wall and then my leg recovered.
My neuro consultant said I had lots of stiffness in my legs and that is the problem, gave me some drugs but send me to sleep.
Unfortunately my left leg, if I now walk too much with my stroller, stops working and will not lift and feels like it is nailed to the floor, I then have to sit on the stroller for 5 minutes for it to recover.
This may seem extreme at the moment but if you bought a mobility scooter for £600 and then parked it outside the shop and then walked about inside as normal, this may have help with the Christmas shopping and give you the freedom of walking and then your legs would recover when driving to the next shop.
Parked my scooter outside the barbers today and walked in for a quick trim.
I know this is not a solution but it will help.