Hi Nowa,
I once had to lay in bed with excruciating pain in one of my thighs for over 3 months. I couldn't weight-bear or walk - I feared (I was terrified) that it would never improve or go. (My doctors had no explanation for the pain - of course!) I also feared that I would never sleep adequately due to the pain.
What got me sleeping, despite the pain - which was so intense, it was 'screaming' at me - was to observe and examine the pain closely and not to mentally run away from it; this CD/MP3 helped me to do that
https://www.soundstrue.com/collections/authors-shinzen-young/products/pain-relief-1 (Pain Relief). With close observation/examination, you realise that the pain and discomfort fluctuates - even if it's very very slightly - and that very very slight lessening in intensity, gave me a chink of hope that I would recover to the point of being able stand and walk again...and eventually I did. I appreciate that the general advice with TMS is to ignore the symptoms, whatever they may be...However, when the symptoms are so excruciating, debilitating or otherwise difficult to bear, paying close attention to them, keeping your breathing calm while you do so, can help you realise that they are not interminable.
With your walking problems, I can only tell you what I do and that is that I know how far I can usually walk and stand before I am overwhelmed (due to fatigue, pain, lack of stamina, shakiness etc.,) so I aim to walk and stand for that length of time each day. Some days I am overwhelmed more quickly than usual and other days I can walk and stand for a tiny bit longer than usual and very very gradually my basic 'usual' has overall has improved a little bit. To allay my fears and any despondency regarding my walking and standing I always try to remember that - as with the pain I endured in my thigh - when things fluctuate (even if it's by the tiniest, minutest amount) it means that there is the capacity there for improvement.
Also, reading the wealth of past threads and postings on this forum and acting on some of the suggestions and doing my own investigations (googling etc.,) into the things discussed on this forum and, in recent weeks, journaling about my 'shadow side'
https://en.wikipedia.org/wiki/Shadow_(psychology) (Shadow (psychology) - Wikipedia) keeps me optimistic that my brain will eventually get the message.
I hope something I've said might help.
Kind wishes,
BloodMoon
P.S. Just thought I'd mention that, although some postings on this forum don't get a reply, I've found that the vast majority do - I think that the time difference makes a difference to when people are available to respond, what with us being in the UK and the majority of forum members being in the States.