We all just do what we can, when we can, one day at a time. What we are capable of varies daily and according to our personalities.
We aim for perfection - then beat ourselves up when we 'fail'. Often, our efforts are truly superhuman, yet still we don't pat ourselves on the back.
We accept that we're expected to be carer, wage earner, mother, chief cook and bottlewasher - all at once.
We exhaust ourselves then feel so terribly guilty about a sharp word to the invalid.
We know we need help but pride prevents us from even asking, so we battle on, beyond all reason - often to the point of making ourselves ill.
One day, we realise we simply can't continue, are forced to ask for assistance - and there it is, a solution, maybe temporary, but enough to give us a break, to evaluate, to admit our limits as human beings.
(My advice would be 'Look after yourself and ask for help sooner - rather than later')