Amy, this is normal. After the 4 weeks, there will be a reassesment, and then probably a reduction in how many times per week you go in. But you will always have to go in for "maintenance". I go every other week, others I know go once a month. Think of it this way, your body has been out of whack for a while, and wants to be out of whack. It takes convincing for it to change and stay that way. 2.5 years ago, my left leg was numb all the way down to my toes. Now, every once in a while I get a little twinge that goes down my hamstring part way, and if I think about what I have done, I usually discover I have been sitting on my leg too often, or picked up something wrong incorrectly or something that has misaligned me. I go in, get adjusted and am fine.
Editing after I read other posts. Folks, I went to an MD after I went chiropractor because insurance at first refused to pay for the rest of chiro treatment. I went through 8 weeks of physical therapy and the pysical therapist was helpful, and knowledgable and I still do the exercises she taught me. But after 8 weeks she said she could do no more for me and doubted I would ever not have a numb leg. 2 months later insurance changed and I went back to the chiro. 8 weeks later I had no numbness, and no pain. PT cost the insurance 85.00 3 times a week, chiro was 40.00 for 3 times a week. They both did ultrasound treatments for the inflamation but chiro also did accupunture, which I was a naysayer at first, and found wonderful results with it.
I was careful about the chiro I chose, getting recommendations from people with back issues first. BTW, my DH still does not trust this and walks around with severe neck pain complaining. He went through the PT route too, and still has pain. Now if he followed what the PT said and continued the exercises she taught, he would probably be better, but I do think chiro would help him.