My left lower back (little close to bottom of spine) as sworeness and kindly fell like knot. it not really painful just annoying. i been having this for a month and after start pick up things. can having orgasms everyday or fiber contribute to this?

Ergonomics: Your back issue is definitely more related to poor ergonomics in rather than orgasms (no effect on your back situation). The knot could either be a muscle spasm vs a rotated facet along the spine, if the back pain continues, you can see a doc for evaluation. Remember to lift with legs and not spine , and never lift and twist at same time (lift 1st, then twist). Lying with Knee to chest may help