Any of those points that feel more "sensitive" than others will be a primary tonic point, as that has a stronger relation to the over all problem as it relates to qi and meridians, so work those ones a little more frequently.

As for how often, you can do it as many times as you like untill the problems lessen enough that you're comfortable, but wait 15 minutes in between each time you do it.

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Oh THAT'S how that works!