I have several symptoms that have led me to believe I have hypoglycemia.

Often I find at dinner times I don't feel 'hungry' but I know that I am hungry because my stomach starts feeling sick. Sometimes I start shaking and feel weak, and get a weird headache, sometimes certain symptoms are absent, and sometimes I have an extra symptom - complete loss of concentration, I can't even concentrate on simple things. Eating always makes the symptoms disappear.