The tick sound from ur back is quiet normal. The only way to get rid of ur back pain is to avoid continuous sitting by repositioning urself in nearly 1 hr. Don't sit for more than 1 hr, then walk for 2-3 min and then again do ur work on chair. Place a cushion between ur seat nd ur lower back. And drink as much water as u can.
Next Steps
if pain still there after 1 week then u have to consult an orthopedician or a physiotherapist.
Health Tips
don't sit for long as "SITTING is the new SMOKING".