Thanks for providing more information.
As per your description,sudden attack of pain in lower back suggests the possibility of Herniated disc,Muscle strain.
So you should firstly continue your Ibuprofen 200 mg every 4 hourly.
And do gentle massage with Capsaicin cream which is a topical analgesic.
And apply warm compresses with a heating pad.
You can wear back support as you have.
And if pain is getting worse with time then you need to make an appointment with your doctor ASAP and further X-ray of lumbosacral spine should be advised.
Physical therapy can be advised.
Hope this helps.
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