i feel that the most important goal is for you to be safe.
if that means using a cane then that's what you should do. and i'd encourage you to tell your dr. he should know about your falls.

i once asked my dad, "when should i buy tires". his response was "when you need them". your situation kind of reminds me of that.

you can go into a medical supply store and try out the various canes. plus there's a particular way to use a cane depending on which leg is bad. i mainly use mine for balance. but i also use a rollator (a walker with a seat) if i were to go into a store (like walgreens). if i'm going into a real store like macy's i would need to take my scooter.

it's not giving in to MS when you decide to use any assistive device. i felt that way too at first. then i realized that anything that conserved my energy so i could do other things was just...necessary. like when i first got a handicapped sticker. i also use a scooter in the grocery store. that way i have enuf energy to come home and put things away.

as you learn to listen to your body you'll figure out what things you need that can help you. and ps...on the rocks. i'd try to fix anything that is a falling risk. perhaps on a small spot you could do just dirt. start thinking about any risk to fall scenario in your home, like rugs. sorry this turned out to be long.