Because LGL is progressive, your body may have been responding to "something" causing your T cells to populate so to "fight something" over time. Often this could be mistaken (especially before rearrangment studies) for LGL. It is very rare, as you know. Today, I believe that most doctors are very careful to diagnose this without new testing available and now being done that can look directly at the T cells for spikes and clonality.
In the past, as I understand it, if the T cell count was above 5000 for over 6 moths, this was "the diagnosis" for LGL. However, this has changed due to recent T cell research. We have learned that T cell poplulation can rise for years as a means for the body to "fight" something, somewhere -- even a cancer.
I am glad you are working...
Save time to rest -- "work at it" if you must.
I am glad that you do not have any health problems now. T cells are a much needed "foundational helper" to your immune system that supports your white cells and overall health.