I use to have this problem as well, but have found that it has stopped.
Some things that I believe have helped me:
Consistently taking a multi-vitamin, calcium/magnesium supplement and a B Complex
I drink Smart Water while exercising. This has Potassium in it. I also sometimes drink Propel water. I drink regular bottled water at other times, but when I exercise, I try to drink a specialized water with potassium in it.
Oh, I try to drink a third of the bottle before hand and the rest during my routine.
Slight increase in healthy low fat protein intake (chicken, salmon, low fat cheese, etc.)
Totally agree with Mrs. D...eating well is expensive, but so very worth it!
The benefits are outstanding.
You will save money in the end in health care and will enjoy each day more fully...being able to give to others in a more complete way.
Best wishes.