Employee worked a full day on 2/15/16 with no complications. EE woke up on 2/16/16 with acute pain in EE's back. EE did not report to work that day. EE went to EE's own primary doctor. EE had at least two follow-up appointments with EE's primary doctor. EE reported to work on 2/22/16. EE had severe pain in EE's back and was sent home. EE went to the ER that day.