Lyme disease is a sort of recovery, active type of syndrome, it works in vicious cycles.
Once you find the triggering emotions permanent healing will take place. EFT definitely helps to get the the root issues. Sometimes however EFT is not very thorough, it can miss issues such as subconscious resistance to resolving issues.
If you feel you have completely forgiven yourself and your family and still have symptoms, I would consider any breaks in the family back to your grandparents. These attitudes get handed down and we may not even be consciously aware of them.
Many cases involve grand parents that have fled their countries and come to the USA as refugees.
You could use EFT to treat the Lyme disease and its corresponding emotional triggers to the ORIGINAL SOURCE; (your subconscious knows what the original source is) and then treat yourself for any vulnerability to taking back any or all of the problems.