Every meridian has an associated source point - that is, the acupuncture point through which the organ is most directly nourished. In the case of the gall bladder, it is GB 49, located in an indentation just under the ankle bone on the outside of the leg, where the meridian changes direction from vertical descent to horizontally approaching the end at the 4th toe.
My experience, as someone who had their gall bladder removed years ago (before I was familiar with five element theory) the source point can become "locked" or "frozen". That means that the point is not polarized, and that energy gets caught and doesn't flow through the point easily.
Stress can lead to this response in any acupuncture point, but I imagine that when an organ has been removed that the source energy can no longer flow to the target organ, making it more likely to get caught. This stuckness has, in my own case, resulted in a sprained ankle on an unexpectedly warm December day. My body could not accomodate the sudden rise of wood energy when the temperature became unseasonably warm (about 30 degrees above the previous day). I didn't trip on anything; rather my ankle just gave way. I ended up with 3 areas of my ankle and foot sprained.
The source point (or any other point that becomes unpolarized) can be kept open by shining a flashlight on the point, by flipping one's hand palm down & up over the point a few times, or by bringing all five finger tips together and holding it about 1/4 inch above the point and turning it back and forth as if turning a key.
I'd also recommend tracing the meridian. Gall Bladder is one of the longest in the body, with many sharp angles. Tracing it regularly can insure that the energy continues to flow.