Hi Janet,
I'm sorry I didn't answer you in a timely manner. Turning the shunt up really isn't an issue as it is done by magnet, but you already know that now. (Sorry, I'm late... :( ) However, sometimes the pressure change can cause headaches, and so forth, until you adjust to the setting, and that can take a while. I'm assuming they are only changing the setting temporarily.
~Mary...
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