stomach pain, headaches, chest pain

I have an eight year old son. He is quite tall for his age but rather skinny.

Ever since he was little I can remember him talking about headaches, stomach aces and pain in the chest, he also suffers from irregular temperatures – his temperature can be high and you give him Panadol and his temperature then drops below 35. Now the Dr’s say that this can’t happened because he would be going through hyperthermia, but I have seen it many times and even brought six thermometers to make sure I wasn’t doing the wrong thing or that they could be broken.

I have taken him to several Dr’s including specialist in the field of paediatricians, heart specialist, etc. They have all done varied and similar testings on him and can’t really define what the problem is.
He has allergies to wheat (low allergy), (high allergy) to many medications, eg Amoxil, Erythromycin, Penicillin, Ceclor (cephalosporin, angel gel and had serum sickness syndrome, the list goes on when it comes to medication.

I really need help, is there someone out there that could give me a little help or is able to guide me in the right direction. I can’t stand him crying all the time with stomach ache and then headache and curled up at night with pillows stuffed in his tummy because he can’t sleep.
If anyone has heard of anything similar, please make contact.

Mum going spare…