According to emedicine, low potassium can cause nausea
, fainting due to low blood pressure, abdominal bloating
, and weakness.
But I see from your journal entry that you might be at least suspecting that you are hypothyroid in state? According to nih, a gov website, early symptoms of this can include being more sensitive to cold, fatigue, weakness and unintentional weight gain.
What part of your neck is hurting- the cervical spine area, the throat or ?