I know it can seem overwhelming, especially changing "horses" in the middle of the stream, as it were. We were in a similar boat a couple of years ago, having been immersed in an OCD diagnosis and all that comes with it for nearly 6 years prior to PANDAS. But it gets easier, and all the folks here on the forum can be great resources for you as they've been for us.
As you have the time and energy, I would paw through the Pinned Threads at the top of this PANDAS forum for some of the basic information and some treatment protocols that have worked well for other families. Many others here also use biomed responses to help keep their kids healthy and to respond to strep exposures. Natural anti-inflammatory supplements are also a favorite, and you'll find lots of threads here regarding items like curcumin, tumeric, quercitin, Vitamin D3, fish oil, and probiotics.
Good luck to you!