Hi Sophie,
I would definitely stick with it if I were you. A month or so ago I was getting mild stiffness in my middle back, and it was often a little sore on waking, especially when asleep on my back, but its rarely sore now and I feel its definitely repairing the back issues I have had for years.
Also, make sure the base you are using to prop up your mattress is completely level...mine was not level and was lopsided by only quarter of an inch, but even that tiny amount was enough to give me shoulder pain a few months back, which disappeared upon correcting it with a spirit level.
If you do decide to try chiropractor then be certain to watch the link at the bottom of this post. Finding a GOOD chiropractor is essential so don't jump into accepting the first person you find...its just not worth risking making things worse.
You should also be sure to understand that it will likely take a number of sessions for any real permanent improvement...I made some phone calls a while back and I was told in no uncertain terms that it would take several months treatment to realistically obtain permanent improvements, and in the UK that would cost me quite a bit of money.
It would be a shame to start treatment only to stop half way through due to lack of funds. I was glad I took the time to ring around first instead of just jumping in, and fortunate enough to find an honest enough Osteopath to tell me straight up front what was involved. He wasn't a chiropractor of course, and they may indeed work differently but I personally prefer to stay with IBT for now. Yes, it may take more time but I am not going anywhere, and I am saving money in the process.
Here is the link I mentioned by great chiropractor John Bergman...