You need to see a spine specialist, either an orthopedic surgeon that specializes in spines or a neurosurgeon that specializes in spines only.
Many things could be going on, and if the lift is off balance now you could be pulling on the opposite side as well.
It could have caused a disc problem as well.
The only way to be sure is to get a full evaluation from a spine specialist and no doubt an MRI to rule in or out any direct spinal issues.
In the mean time, you could try icing the area that hurts. If that doesn't help then try some moist heat.
I posted a thread on an easy way to get moist heat. you can give that a try as well.
Also you could try some ibuprofen and see if that will decrease some of the inflammation.
Good luck
Fran