I too have shouted at my poor mum ...I feel so bad and I always say I'm sorry ...but I do agree it's the sleep or lack of it , trying to hang on to a small thread of normal life and dealing with all the day to day stuff ...and it's so hard to keep calm all the time . We have just had a blow to mum's diagnosis as it could be dementia with Lewy bodies . Vascular dementia was the first diagnosis...which is what my dad had and passed away 4 years ago ...a 2 year gap and then after moving in with my mum as it seem to make sense as we are both widows...mum got this .