acute lyme infection

about 2 1/2 weeks ago, I noticed an 1-2 cm red circle on my very upper thigh. I could harly see so I had my hubby take a pic. It didn't itch or hurt. I don't recall any tick bite, but I live in a more rural area of Minnesota.
about 2 weeks after noticing that rash, I began horrible joint pain. Hips, knees, shoulders and a headashe. Ibuprofen helped, but I also became sweaty everytime I took it. Finally the light bulb turned on and I took my temp. It was 101.
I made an appointment to see nurse practitioner for lyme testing. By this time, my temp had reached 102.2.
She drew CBC, CRP, tick borne illness testing and lyme testing (2 tier, ELISA and western blot)
Called me later that evening to let me know that CRP was elevated and she was just going to start a 21 day course of doxycyline. Started that on Tuesday evening.
ELISA came back positive, but blot came back negative.
She told me to continue doxy and I have been afebrile all day so far today.
Do you thick I actually have lymes?
and If so do you thick because we started treatment so quickly that I will avoid future problems.

Yes, if you had the rash you had Lyme. Assuming you actually had the Lyme rash which is pretty distinctive. You are lucky to have a healthcare professional who actually did the right thing. Tests are FREQUENTLY negative in the first month of illness. This is an undebated wildly established problem with serologic testing. It takes your body up to a month to produce detectable levels of antibodies. At the least I would treat until symptoms are gone. Some say longer, but there's no hard evidence. Outcome is pretty good for early illness usually. It's typically people who are treated late (months after) who struggle. Even if treatments not 100% you're stopping the bug from getting a strong foothold in your body so you're probably going to have an easier time treating it in the long term. Heck, even me who caught it 3 years late is still doing pretty well on treatment.

Just don't let anyone tell you you're cured until your symptoms are gone. It's pseudoscience. There is no test for cure or proof that "autoimmunity" occurs after the disease. Assume you're sick until you feel well.