@megidigo Hi. I am so sorry for your situation. I can tell you that things you wrote explain situation my dad was just 2 years ago. He was diagnosed with severe sensorimotor axonal polyneuropathy which is as they said idiopathic. Long story short they gave him some meds for pain eventho he didn't really have much pain but could barely walk and had heavy foot drop, severe muscle loss and situation was getting worse and worse. What changed for him was initially testosterone therapy which gave him strength, energy, better sleep, improved mood and easier way to make more muscle and improve bone density. He also had anemia which improved with TRT as well. His issue with toes improved significantly once he started wearing toe spacers and introduced daily walking (he couldn't walk before at all or barely). He now does around 10000 steps but also walks backwards for about 10 minutes a day which has amazing benefits for balance and gait. He also started gym and gained muscles in legs and whole posterior chain, improved diet a lot (high protein, high fiber and more anti-inflammatory foods - salmon, grass fed grass finished beef, lots of veggies and fruit, and supplements like omega 3 fish oil EPA and DHA and D3+K2). He also takes B complex and A-lipoic acid.
Unfortunately, there is no cure for this disease, but situation can be improved a lot with exercise (both aerobic and anaerobic), diet and supplements. He also told me that what helps his cramps a lot is leg bath with warm water and epsom salt as well as some topical creams which improve circulation afterwards.
You have to attack this disease from many angles but once you get use to it it's not a biggie. My dad could not walk at all and now he is walking and going to the gym. I have to say it's not perfect. He still has issues, but where he was and where is he now is day and night.

I know its a lot of things but please don't lose hope and try to start adding 1 thing at a time. My dad is 71 and if he can improve that much at his age so can you as a much younger person.