Your symptoms look to be related to some type of food you are eating. First thought is coeliac's disease (the body's immune system attacks itself when gluten is eaten) so rule that out. Do not start a gluten free diet prior to being tested for coeliac disease.
Symptoms such as lack of motivation and apathy are some noted symptoms of low dopamine levels. There are many causes of low dopamine but includes nutrients deficiencies such as magnesium, iron, zinc, vitamin B3, vitamin B6, vitamin C, vitamin D.
Excerpt from Celiac Australia...
"The symptoms of coeliac disease vary considerably. Some people experience severe symptoms while others are asymptomatic (they have no obvious symptoms at all).
Symptoms can include one or more of the following:
* gastrointestinal symptoms e.g. diarrhoea, constipation, nausea, vomiting, flatulence, cramping, bloating, abdominal pain, steatorrhea
* fatigue, weakness and lethargy
* iron deficiency anaemia and/or other vitamin and mineral deficiencies
* failure to thrive or delayed puberty in children
* weight loss (although some people may gain weight)
* bone and joint pains
* recurrent mouth ulcers and/or swelling of mouth or tongue
* altered mental alertness and irritability
* skin rashes such as dermatitis herpetiformis
* easy bruising of the skin"