I'm having a back ache

I got a back ache after raking the dried leaves outside yesterday. I''m already having back aches especially when I spend a lot of time with the computer since I don't have a chair with a back rest. But the pain that I felt yesterday was different, it was really painful and it made me sleep early. And this morning, I had the difficulty waking up coz of the back ache. Though I'm not a an acid reflux sufferer, but how I wish I have a incliner sleep wedge so I can elevate my head and back a little bit in the hope of easing the pain.