Not so much looking for help, but offering a possible answer, as many of the treads here seem to have familiar symptoms. If you have some of the following symptoms and fly regularly, or became ill after a particular flight, it might be worth reading on, as many fellow sufferers I know had no idea what was making them ill.
Aerotoxic Syndrome symptoms (any number may be observed)
Blurred or tunnel vision
Shaking and tremors
Loss of balance and vertigo
Loss of consciousness
Sudden memory impairment
Confusion and feeling intoxicated
Gastro-intestinal problems (diarrhoea)
Breathing difficulties (shortness of breath)
Tightness in chest
Respiratory failure requiring oxygen
Increased heart rate and palpitations
Irritation of eyes, nose and upper airways
Sufferers may have had diagnoses of CFS/ME, MCS, mysterious viral infection, depression, sleep disorders, stress, anxiety, "it's in your head", "stop complaining", etc.
Airliner cabin air comes from the engines and can get contaminated with engine oil, which contains a cocktail of toxins. If an engine oil seal is faulty it may let a certain amount of oil into the air supply, ranging from imperceptible to an odd smell to thick smoke in the cabin.
These symptoms are similar to Gulf War Syndrome or poisoning by other toxins such as pesticides.