Pain in lower back and floating feeling.

I have pain in lower back from quite a long time, like from several year, but i didn't pay any heed to it, unless now, from past one year i have sudden floating feeling while walking. The pain is such that, if i sleep straight or in one position i cant get up easily due to pain, the lower back becomes extremely tight. Because of which I can't sleep straight, and sleeping on side continuos is causing lot of neck pain since long. Same while i clean the house, back becomes tight, can bend without difficulty but. Also, i feel more dizzy or floating feeling when I wear my shoes fully, if my half leg is out, then not much issue, not much dizzy feeling. I don't know what's going on in my body, really concerned, please help. Thanks