This is totally anecdotal information from someone not trained in medicine.
I believe I had Lyme disease, but was not correctly diagnosed. It was only later, after reading the symptoms online, that I realized this. I had a circular rash around a tic bite, then flulike symptoms: fever, joint pain, and headache.
I thought it was the flu, and stayed home for three days, feeling miserable and getting little sleep. I was unaware of it, but during that time I became severly dehydrated. I believe this contributed to my longer-than-usual recovery time of almost a month.
I was hospitalized and got rehydrated and lots of antibiotics intravenously. It took two or three "experiments" with antibiotics before they found one that started working to relieve the symptoms. Sorry, but I don't recall what it was called.
Bear