My 3yr has pains in her arms, legs and complained of tummy ache for 2 mnths, doc said nothing, now headaches, tired and has had 1 weird hallucination?

Go back: The list of possible causes to her symptoms is long. She may even have a central nervous system issue or infection like lyme disease. Often with a variety of symptoms as hers, you aren't given a diagnosis the first time you're evaluated so she needs to go back and ask the doctor to re-evaluate her for other causes. If you aren't comfortable with the evaluation and diagnosis get another opinion.

Plumbism?: Child with abdominal pain associated with leg pains etc make sure lead level is normal check also for sickle cell anemia go back to your doctor for evaluation.