I believe I strained my lower back.  After a week or gardening and staining Decks I was sore but not limited.  Saturday while cleaning the kitchen I was sitting o a chair and reached down for something when all of a sudden I had a sharp pain in my lower back and couldnt move.  My husband managed to get me to the couch but I needed to lie flat so painstakingly we went upstairs.  I started ibuprofen  and had some flexoril so I took that too (10 mg).  I can barely walk to the bathroom..it is painful to walk, bend...just cant do youThat.  I have been in bed on a heating pad since yesterday morning.   Took a hot tub this morning and tried some light stretching.  All I can do is manage to the bathroom and back..weakness on my left side so I cant put a lot of pressure on it.  Any other suggestions?   I cant sit up in chair..cant manage walking much without terrible pain.
I read your question carefully, and I understand the pain you're in. In terms of medication I believe you have taken the right steps. NSAID Chat Doctor.  Heat application and the use of a lumbar support may help as well. If the pain is not controlled through these meds another painkiller like Tramadol can be used. If despite these measures the symptoms persist in time or worsen then I suggest imaging studies are done to look for the exact cause, whether there is an issue like fracture or disc herniation for which surgery or local injections might be considered. I hope you will get better soon.