Noted your short and specific history of right sided lower back pain
which increases on certain movements.
This is classical of the muscular strain or sprain causing spasms too.
This can be easily diagnosed by doing a clinical examination by a Doctor and be treated specifically.
Anti-inflammatory medications.Muscle relaxant
Local rubefacient liniment that increases local heat and relaxes muscles.Bed rest
is very important as more you move more will be spasm.
Also needed is to rule out other causes like spinal cord
problems, right kidney and ureter problems, colitis
and so on as these can cause such spasms of local muscles.
Get an MRI of the affected area done if there is no relief.
Hope I have answered your query. Let me know if I can assist you further.
Dr. T. Chandrakant, General Surgeon