Sounds like neuropathy and Lyme and friends also cause weakness in legs, feet, arms, hands...you name it. My legs started improving a lot through treatment but got weak again due to the equillibrium issues. I went through the battery of nerve tests and everything in my legs, feet, arms and hands were normal so it was the disease.
Talk to your doctor. Don (Heather's Dad) who is on here sometimes had a great remedy for leg weakness. It was intense.
Also what I found helpful were detox baths (I still do them). I use dead sea salt and baking soda (hey that's my bath of choice). I tried the hydro peroxide bath...too much for me.
The dead sea salt helps put magnesium and minerals back into you body and baking soda is a cleansing agent. Again I personally use baking soda.
I will find Don's protocol and paste it to a message. I have not tried it but it worked for his daughter. She is back to swimming and has a full life again!
Key thing is to detox....Lyme can get into your muscles.
"Hope is that stubborn thing inside us that insists, despite all evidence to the contrary, that something better awaits us."
And that something is total healing for all!