Yes, I had chronic Lyme, perhaps still have it to some extent... it tends to persist in a hidden way... I didn't feel that UT brought on more HERXs but I did have extremely difficult symptoms while fasting on UT.
I would suggest that you try UT as a homeopathic remedy in combination with other healing modalities. A good one is the thistle root tincture... teasal root. You could make it now, it's the time of the year for it. Some people find that minimal dosage corrects their body's immune response to Lyme and gets them highly functional again.
Others may have more suggestions. I would definitely repost this and put your question in the heading.