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It's quite possible you just had a bout with a summer virus that caused the symptoms and the medications had nothing to do with it at all. The results you had (low sodium, chloride, etc.) can be from electrolyte imbalance due to your intake. Muscle cramps can also come from electrolyte imbalance. Since the liver function tests were normal, it probably isn't the statin that was causing the problems.
The results of the scheduled blood work in two weeks will show if there is anything to be concerned about. Since the results you already had were clinically insignificant, you can assume you have nothing to worry about and enjoy your next week.
If you are going to a dry climate. don't wait until you are thirsty to drink. When in a hot, dry climate and exercising, you need at the very least 8 ounces of replacement fluid per hour. That fluid can be water if you are just out for an hour or two. Beyond that length of time, a fluid with electrolytes is better (Gatorade, etc.).
Have fun and try not to worry,
All the best,