A stitch in time saves nine, so it is commonly said. Likewise, all a children presenting special needs requires is you to take them to the specialists to assess him or her. Stop saying that the child is difficult, get medical assessment and advice.
Thereafter, pour your love upon them. For in as much as they are differenr from others, their need for love and your care do not diminish. They actually need tonnes of it.
You never know, you may end up prolonging a life that was meant to be cut short after a few months from birth.