Hi Karen, I was given lots of blood tests and thorough examination.Id had a similar episode in July and had xrays, MRI scan, Holter device for 24 hours at that time.all normal.my diabetes consultant had flagged low sodium 12 months ago but wasn't overly concerned and told me to cut down on water consumption as too much can dilute sodium levels.Anyway I've been taking 2 dioralyte since Wednesday, was advised to drink only when thirsty and have a blood test on Monday to check levels. Still feeling tired though.Hopefully it will improve.