You have definitely over extended yourself at the gym, and while your back is like this you will be getting a build up of fluid in your back. I would take some anti inflammatory's to help ease the fluid. Also where the nerve is pinched, pressure needs to be put on it with a thumb or index finger until the pain releases. That is generally a good quick cure if it's not too badly effected.
The fact it has been like this for a week now will most likely mean you will have crossed ligaments as well, as that is generally what happens when something is left like this for a few days. A few days to a week is a long time to have a back out of place and damage does get caused by this.
I suggest you go back to your chiropractor and get them to manipulate your back more. It wont heal straight away either, but once it's properly manipulated it should come good within a couple days.
Or you could go and get a good massage as a massage can loosen it all up because it is basically a 'knot'
Make sure you go to a good place that knows what they're doing.
And make sure you take it easy at the gym, and use the proper technique and don't try to life too heavy of weights. If you can't do a proper rep without jerking yourself, then the weight is too heavy. You need to be able to train in a slow and controlled pace. i know this because i have done this to myself quite a few times
Good luck! You'll be right, you'll come good.