Hi,
It is not clear whether you had an MRI of the leg or the hip joint . I would suggest an MRI of the hip joint and spine . It seems that there is a peripheral nerve trauma due to the fall . An injury can also cause leg pain from: A torn or overstretched muscle (strain) ,Hairline crack in the bone (stress fracture) ,Inflamed tendon (tendinitis) ,Shin splints -- pain in the front of your leg related to overuse or repetitive pounding , Sciatic nerve pain (radiating pain down the leg) caused by a slipped disk in the back. I would also suggest a consultation with an orthopaedic surgeon and neurologist to find out the cause .The pain in the joints may be due to arthritis and osteoporosis . Hope this helps you . Take care and regards !
Fighting multiple medical problems is a difficult way but sometimes the most difficult thing is there is no aetiology for some problems.
As for your breast cancer it was diagnosed and you are well off with the cancer.
The leg problem emanated after the fall and due to complications you developed and later part you have intensified your problem and there is no clear diagnosis to go in a proper line of treatment.
I would advice you to follow up near a good neurologist to come to proper diagnosis and treatment.
Keep trying and pain killers should only be used intermittently. Take care!
Take care!