Before doing any home remedies to ease the pain, you should get it checked out by a neurologist if the pain continues. You could possibly have a ruptured or bulging disk. If this has been going on since December, I wouldn't think it's a muscle problem. I say this because I've had several back surgeries, ultimately ending with getting 4 screws and a cage put into my back, so I know a little about back problems and referred pain you can get with it. Does the pain ever travel down your legs or do your legs ever feel numb? If so, that could be related to a disk problem or nerve irritation in the back. My suggestion would be to see a specialist since it's been ongoing for several months.