Im either tired or exhausted all the time for past 3 months.
Could my one bad tooth make my legs and arms hurt all the time and make me feel sick all the time?

If your body is fighting an infection, yes, fatique could be a symptom. A tooth in your mouth that has become infected or impacted can effect your system in a bad way. You should really have that taken care of soon,

That really sounds like Mono also known as Eptein Barr Syndrome which is not serious just a pain in the and can ladt months and even after u fight the infection, u can have residual effects f I r some time. Its jokingky known as the kissing disease because a lot of teenagers get it, usually from sharing drinks. It causes extreme fatigue, muscle and joint pain and other flu like dymptoms. U should look it up on the net.