Pervasive Developmental Disorder is better known as autism, but is specified with several different types of the disorder in the manual for these disorders under the PDD category.
Generally, when the diagnosis is PDD, you are talking about a child whose diagnosis is PDD-NOS, or Pervasive Developmental Disorder Not Otherwise Specified. That is the less specific diagnostic name for kids who are on the autistic spectrum, but don't meet any of the diagnositic standards for a specfic autsistic disorder, such as Asperger (someone with this diagnosis could be said to have PDD- Asperger syndrome.)
For all ASD's (or PDD's) children are treated according to thier symtoms. Almost certainly, speech therapy will be neccessary (but each child's therapy would depend on their specific needs in speech and language.)
Most need Occupational therapy too, but thier treament plans will be dependent on the needs they have, sensory, visual motor, visual perceptual, vestibular, etc.
Many do well with play therapy or cognitive behavioral therapy, and most will do well will social skills groups.
For more severe cases, Applied Behaviroal Anayisis or ABA therapy is helpful. This therapy is done by professionals in a theraputic enviornment and may take up to 40 hours a week or more. It is very intensive therapy.
Medical care and psychiatric care is also based on the symptoms per the child, if anxiety, inattention, agression, mood, aggitation or depression are issues, as are common, then medical care is based on those specific needs.
The books are many, Tony Attwood is great if you have a high functioning kid or a child with asperger. Mel Levine writes many broader spectrum books about the kinds of issues that all children with brain disorders face. All Kinds of Minds is a wonderful book about many different brain issues and symptoms and how to treat them.
Most children do not outgrow autism, although early intervention is going to make their functioning level much better than it would be otherwise. Proper advocacy in school is going to help you get through too, www.wrightslaw.com will give you nearly all the information you need to learn to advocate well.
As for handling it, it is not an easy road, but you will make it. Be ready, just as you think you have it all figured out, it will change and you will need to go back to the drawing board; it is the nature of the beast. Developmental disorders are moving targets with moving goals, which is the nature of development. It is certainly never boring.
If you are a primary caregiver, you may find yourself needing psychiatric care, which is very common (more common than not) so if you feel hopeless or exhausted, seek care. Take very careful care of your marriage as well, developmental issues can be trying on marriage.
If you do not have an evaluation of your child from a Developmental Pediatrician that spells out a full treatment plan, then make an appointment and get one. It is worth the time and effort, and this kind of doctor will spend many hours with your child, and will call in every kind of professional they need from speech to genticists. If you do not have speech and OT yet, you can get evaluations and start that therapy while you wait for an appointment with the Developmental pediatrician, but keep that appointment even if you see progress, because you want to be sure that you are not missing any of your child's needs. Speech therapists and OT's are good to ask for toy suggestions that may help your child to progress. You can find Developmental Pediatricians at your nearest Childrens Hospital, and I would highly recomend one for evaluation, and then treatment through a very accessable board certified child psychiartist.
There are many of us on this site who have kids on the spectrum, you will find a lot of support and advice when you need it!
M.