Hi Pacman, welcome to our community. So, sorry you have been suffering for so long.
You really should see a LLMD for treatment, if at all possible.
The 100 mg twice daily of doxy isn't enough to effectively treat the lyme disease. It will only stop it from replicating.
Would your MD be agreeable to giving you 200 mg twice daily?
Here is the link to the ILADS guidelines - maybe you can print it off for you Dr. to see.
ILADS = International Lyme and Associated Diseases Society.
In these guidelines, there is a link to Dr. Burrascano's (well-known LLMD) treatment guidelines showing the doses of the different antibiotics to treat lyme disease.
www.ilads.org/lyme/treatment-guideline.php