If i ask 4 discectomy to treat l5s1 disc protusion over pysio/injection for quick fix.will a doc listen/overule me.long treatment will loose my job?

No quick fix: I would caution your thought process in terms of "fixing" this issue. Surgery may be an acceptable option for you, but i would consider the advice you are being given by the surgeon. Surgery has long term consequences as well that have to be considered. There should not have to be a long delay to include pt and/or injections before heading to the or.

Reasons for surgery: Most discs resolve on their own within about 2 months. So conservative measures are used during that time. Reasons for surgery are patients with significant neurological deficit (weakness, or rarely bowel/bladder incontinence). Other reason is for intractable pain. Speak to a neurosurgeon/spinal surgeon. All the best.