1) Once an adult sprains the ankle, it is always going to be easier than "baseline" to re-sprain it. You MAY need to wear an ankle brace when you walk as a possible fall preventative.
2) Do you have a connective tissue disease associated with "loose or weak tendons" (Ehlers danlos, Marfans, etc.)? These are associated with ankle -- or other joint -- sprains and other problems (unlikely, but need to get a better history from you and ideally examine you for tendon laxity -- if you can make your thumb bend back to touch the forearm, you have "tendon laxity" -- and MAYBE a connective tissue problem like Marfans, etc.).
Now I DOUBT you have this problem -- as these diseases are NOT common -- and you probably would have had prior and/or other problems that brought you to the attention of a doctor, but as I don't know your history, it would be a "rule out."
3) You DEFINITELY need to find out WHY you are falling repeatedly! This is a potentially serious or even fatal problem (especially if you hit your head or break a hip).
COMMON reasons for repeated falling include:
1) Neurological problems: That could cause weakness, imbalance, or dizziness/vertigo, which could be centered in the brain (like an old stroke or a tumor), inner ear (like Menieres or other causes of vertigo) neck -- like spinal stenosis -- or spine, from arthritis and/or degenerative disc disease.
2) Orthostasis: Where your blood pressure drops upon standing (common in older people, especially if on a blood pressure medicine or diuretic).
3) Foot drop: If you tend to "stub" the involved foot when you walk (this could result from an old stroke, a spine problem, or nerve degeneration)
4) In older folks (I don't know your age), there may be more than just one underlying problem that results in repeated falling, so a complete history and physical exam is MANDATORY before you have a worse complication than just a sprained ankle!
suggest proprioceptive dysfunction. Nerve endings around our joints that allow us to appreciate spatial relationships of our anatomy and appropriately adjust if placed in awkward positions. Structural dysfunction results from true ligament disturbance by tear or attenuation or bony deformity that drives our ankle to rotate inappropriately. There are situations that ankle instability arises from both functional and structural deficits.