Congrats on making the appointment!
The coinfection tests are less reliable than the Lyme tests...and they are even more expensive. I'd defer to your LLMD's best judgement.
Tickbite's recommendations are excellent. I suggest you also start a detox protocol - get some of those bug toxins out of your system now so there will be less to deal with once you start treatment. This site has some good detox ideas:
www.tiredoflyme.com/detox-methods.html