Firstly singar I am sorry that you are unwell and hope that things improve for you.
We are and have been through someting similar, I underwent surgery in Feb and had major complications. My boys are 4 and 3 adn both reacted very differntly. DS1 was very good during my hospitalisation and then pushed me to the limit once I was released.
DS2 was and still is very clingly and refuses to eat and sleep.
I have spoke to a child phycologist via the local sure start centre and she assured me that DS2 is controlling the only things he can sleep and food and that we have to be firm and stong with him.
DS1 has been very naughty since I got out of hospital and I was far too unwell to disapline him, so things have been really hard.
The one thing that has helped is consistancy. Now I am physically improving, I am able to take a bit more contol over their disapline.
Also we found that relatives have been more leniant than we would have been,
I found it much harder to be as strict as I was before I went into hospital. I wasnt well enough, plus I was just thankful to be out and OK and I wanted to shower them with love.
Children will push the boundries, you need to establish them again where you are comfortable you can keep them.
I agree that excercise is important. The best thing I did was contact homestart and our volenteer is fantastic. we would all go to the park and I would sit and watch and she would do all the physical stuff.
I also tried to keep to routine at home and did go back to swimming etc with them far earlier than I would have done, but they enjoyed it so much, it was and is worth the suffering for the rest of the day and night
They seem to know your weakness and pray on them. Ds2 would lash out and then get really upset that he had hurt me and then he would laugh about it - he was confused.
Try sure start they really helped me.
Good luck