Hello dear Warm welcome to Healthcaremagic.com I have evaluated your query in details . * Hiatus hernia will not cause black outs . Large hiatus hernia can cause vomiting through reflux of stomach contents . * Cause of triad of symptoms in your case seems to be electrolyte imbalance , magnesium deficiency or else . Hope this will help you for sure . Wishing you fine recovery . Welcome for any further guidance . Regards .