Thimersol (and all other Hg-containing preservatives) have been removed from vaccines. Autism cases not only continue to occur, they are rising. What more needs to be said? Mercury (Hg) in vaccines did not cause autism. Now, that doesn't mean that the active or some other inactive ingredient in a vaccine could be to blame. (Vaccines are biologically powerful, that why we use them.) However, its not the mercury.
The chemical form of Hg has an enormous effect on its toxicity. Simply knowing the concentration of total Hg tells you nothing. Its no surprise that after injecting a child with a vaccine that contains a mercury-based preservative that his her or her blood concentrations of Hg would rise. But, that doesn't mean that the form of Hg in the blood was dangerous or caused the patient's autism.
Thimersol was used in contact lens solutions for many years. It didn't cause Hg poisoning in the millions of its users in that case. Another use of Hg is in fillings. Unless you are cavity free, your mouth is filled with both Hg and silver, both of which are toxic in certain forms and harmless in other forms.
"Signs of Hg poisoning" is just very, very vague. "Fact" lots of things, autism included, have the same symptoms as Hg poisoning.
Honestly, I really feel for you. I can imagine how sad it would be to have a child afflicted with this disease. However, plenty of very good, agenda free, scientists and doctors have looked at this issue and decided that autism is not caused by the Hg that used to be used in vaccines. Personally, I suggest you focus on real, effective behavioral therapy for your child's symptoms and supporting the real, legitimate scientific efforts to understand, prevent, and treat this disease.
Finally, I wish I was wrong. If all autism was just a case of Hg poisoning, we could cure the disease tomorrow. In fact, it would already be cured, since Hg has been removed from vaccines.