I can sort some of your problems
1) shutting yourself away will not help, my dad is in a wheel chair and requires 24 hour care- hard as it can be try to keep some structure. My dad goes on the internet and does a class at local community centre.
2) I have 2 friends one with mixed connective tissue disease and the other with spinal problems. My advice after seeing my uncle with dementia and parkinsons screwed by atos is this:-
a) keep everything and only deal with atos in writing
b) get CAB to fill your forms in and
request any assessment is recorded.
c) As soon as assessment is complete, ask CAB to request a copy in writing from your benefits office.
d) If you get screwed- send Dippypud and myself a PM - atos and DWP can be forced to back up.
Main thing is people do care and will try to help if they can