severe constipation for my 3 yr old son!!! pls help

Sometimes it can become a vicious cycle as the child may be afraid of pooping and that also causes constipation. With my youngest I noticed that he will not do it if we are not at home so I hade to limit my visits to other houses (max one night away). He also got scared (as it hurted) so for many months I had the potty in the living room and he watched cartoons while he did it (to relax). Was so embarrassed when had some guests over and he walked to the bathroom, got the potty and sat in front of the TV ...

The important thing is the diet. Lot of fruits, veggies, seeds and nuts. Limit amount of white flour, sugar, white rice and pasta. Lot of fluids to drink.

severe constipation for my 3 yr old son!!! pls help