I love my boys and wouldn't change them for the world, but I have to say there is a sadness that creeps in when they have problems at school, can't find like-minded friends and other parents say insensitive things etc. Even something like DH taking DS6 swimming this morning ended in tears as the local pool was too busy and too noisy and DS6 found it totally overwhelming and just started crying. I think that when you have a child who reacts a lot to environments etc. it can be upsetting seeing them struggle and can cause a lot of concern about how they will cope.
I would never suggest it is anything like having cancer, but there is for me a sadness that DS6 and DS4 are not and will never be carefree children. They are anxious about numerous things (death, war, noise, too many people, black holes - the list is endless). Neither of them deal with seperation from home to go to school very well and they both find school quite stressful.
I am not ungrateful, but sometimes I do wish that life was easier for them (that is only natural as I am a parent) and I feel a huge responsilbilty to make sure that they are able to cope with life as they get older. Obviously all children are different and this is just my opinion based on my experiences with my boys, maybe I just don't deal with it as well as everyone else.