you need to get consultation from
ent specialist for cause of knot in neck
it may be
lymph node due to chronic infection of head and neck organs
if clear you need to get stomach examined if any problem in
ultrasound abdomen
if nothing come in tests need to get blood serum tests for wheat milk potato egg rice nuts and other common food you take as one of the food instead of giving energy give negetive results and there are many cases of wheat and
milk allergy giving these symptomps of tiredness
this can happen in any age at any time