Hi Cate,
The first thing I thought of was Lyme Disease - and that was before you mentioned the tick bite. Symptoms are cyclical as the critters die off then reproduce. It can show a myriad of symptoms. The tests are not accurate unless you happen to be tested at the right time during the cycle. I have had it 3 times but I was fortunate to have a doctor that treated me based on symptoms and one time on a known tick bite. I received 2 weeks of Doxycycline and that was all it took thankfully. Doctors are prone to dismiss tick diseases for some reason so if you decide to pursue that avenue be sure your doctor is open minded.
All the best, Sally
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