I'm sorry I can't address more than this, but a positive RPR here, with the negative FTA-ABS is a false positive. You don't have syphilis.
There are some things that can cause that, other than just a fluke. Lupus is indeed one of them, as is Lyme Disease, HIV, and malaria. Pregnancy is one, but that doesn't seem to be a concern here.
You don't have to have the butterfly rash, and the only way to rule out lupus for sure is testing.
I'd ask for some specific testing here - Lyme, ANA antibodies and some others for lupus - https://www.medicalnewstoday.com/articles/323653.php#diagnosis.
Let us know what happens. I'm sure others will come along to help, too.
"None of my symptoms seem connected with one another..."
When the immune system goes awry, it can produce all of your symptoms and more. It would take an immense amount of mental effort to absorb and coalesce all the info you'd need to know about these types of things. I hope you do go down that path regardless, as that's probably your best chance to help yourself. Expect endless complexity.
Or, a simple approach would be to get your doc to stop the Birth Control, just to see if that might help. There is such a thing as drug induced lupus, and BC is one of many such drugs. Why possible stroke/TIA in a young female? BC is a known risk factor there - though the mechanism isn't fully known, so an eventual negative D-dimer looking for a DVT doesn't necessarily apply (though that result was truly helpful to know about overall anyway).
But you don't have to be confined to thinking of lupus specifically - since nobody knows what it is exactly.
I second the Lyme possibility. My story spans 4 decades with nuero sx, pain and fatigue. There are multiple bacterial Lyme infections displaying a wide range of strange symptoms; today's Great Imitator. Millions of people go undiagnosed with Lyme, one appt at a time. The thing to know is that none of the doctors in mainstream medicine are responsible for diagnosing Lyme Disease. Mine all told me 'Impossible'. this is standard. You have to find a private Lyme Dr on your own. Life changing. A great intro to Lyme is Under Our Skin documentary- watch the trailer free on Amazon.
In HS I noticed an itchiness in my brain and subtly wondered if it could be something. It progressed to numbness of face and hands, pins and needles. I've had bouts of leg ataxia where a few times I went to walk and could not feel the contact with the ground so fell. The spaceyness is called Brain Fog. It is the infection- I've got lots of lesions. The vaguas nerve can also be involved which depresses the CNS. Many tests showed signs of infection, but the only solution is antibiotics and you have to see an LLMD for that kind of treatment. I also have a histamine problem, from the infection, antibiotics and other irritants- these effects are cumulative, so removing what you can as early as you can figure it out is key. And oh YES, brain On Fire!! I also had decades of CRPS chronic pain that only narcotics could manage. I am pain free a year now, after Lyme treatment. My form of Lyme is Bartonella= cat scratch fever. There are several ways to contract it, but only one solution, you know my schpeel…
oh and p.s. it almost killed me- my liver and heart got infected when I got really sick over a few days and it just kept going for 2 years until I was finally diagnosed with sepsis. Then almost refused treatment due to chronic condition. Then I found an LLMD bc someone with Lyme gave me this tip. I have a long scrappy story and people still look at me and find it hard to believe I'm ill at all. good luck to you!