Hi there. I have had extreme fatigue and weakness for a few months now. I was sleeping more than necessary and at times, sleeping up to 15-20 hours on weekends in addition to achy joints. I recently went to the Dr. because of a sore tooth. I scheduled a root canal and at that time, I was given an antibiotic, Clindamycin HCL 300mg, taking it every 6 hours for 10 days. I have completed the medication and feel amazingly better. I feel very awake and the extreme fatigue I was feeling has subsided substantially. Could the tooth infection be the cause of the extreme fatigue and constant achy feeling?