If you had fatigue and aches after a tick bite, how long would it last- would you just keep getting worse until treated?

That depends: We don't have much information. In some areas of the country Lyme Disease can occur.In the US tick bites have potential for transmitting a number of diseases: Lyme Disease, Anaplasmosis, Babesiosis, Borrelia mayonii, Borrelia miyamotoi, Colorado tick fever, Ehrlichiosism , Powassan disease, Heartland virus, Rickettsia parkeri rickettsiosis, Rocky Mountain spotted fever (RMSF), Tickborne relapsing