I had the similiar experience several times now. The GP (regular doctor) thinks it may be my gallbladder. I did have a scan and the results were "sludge" (not stones) in my gallbladder and I was told that most likely I would continue to have the problem and it may worsen. I have had several months of IV abx so it is not a complete suprise. Just share it with your doctor on your next visit.
There really is no pattern to this crazy Lyme!
Bull's Eye Rash 9/07 (DX as cellulitis)
Symptpms:headaches, extreme fatigue, insomnia
GP DX "Depressed & busy mom"
Saw Rheumotologist 2/08
Lyme test equivocal
LLMD seen 4/08