feeling_sad

Hi,
I have spent many nights here hoping to figure out what went wrong with my 2.4 y/o son. As all mothers would say about their babies, he's a beautiful, loving boy. Thankfully, the loving and beauty parts have not changed, but so much has. From much reading and research, it is obvious that he has autistic characteristics. He will be assessed but I wanted to know what I'm dealing with in case they told me he was in fact autistic.
I have read so much about the effects of MMR vaccinations and their possible link to autism, but looking back, I don't think that was the time things began to change for him. However, after a meningitis outbreak in my city, there was a city-wide vaccination for meningitis and like the good parent I am, I lead him to it like a lamb to it's slaughter. I can honestly say that it was shortly after that time that my little angle left us and went into a funny world of his own. He used to address me as "mama" and now, nothing. Even though he was still too young for accurate speech, he would lead me to the cupboard where the plastic cups are when he was thirsty. Now, nothing. I have to keep offering him water just in case he was thirsty. But the amazing part here is his ability to run the computer. I read somewhere that autistic children, and sometimes adults, need to be taught to use a mouse. He can do that and more. He knows excatly what CD he wants and what icon to click on. He knows when to press play, exit, minimize, etc. I cannot tell you enough about his computer abilities, his memory games, and any other toy that interacts with him. He is very loving and loves to laugh. However, his smiles have to be induced and are never offered by him just because. He will walk with me anywhere and will hold my hand the entire way, yet will make eye contact with me only in the morning. He does not spin in circle or spin his toys in cirlces, he uses his toys the way they were made to be used, yet he will not engage in any kind of imaginative play. He has never approached another child for play. He has never acted in a manner that scared me, like hitting his head or biting his arm, yet I noticed he liked oral stimulation because he loves to lick things..... food. He can lick a cookie for an hour before eating it. I have started him on a gf/cf diet and it has been 4 days now. I know, not much time to notice a change yet, but I'm really hoping that it will help. I purchased vitamins, B6, mangesium, folic acid, vitamin C, and one more but I can't remember the name. I gave some to him a couple of times but had to stop. I stopped because I don't know the dosage he requires and I'm affraid to harm him. I have now ordered Super-Nu something just so I don't mess up with dosages. Next, he gets his hearing checked, but I know it's fine. Then comes the autistic evaluation. I know what I will be told...if not autism, then pdd. I'm obviosly confused and very sad.