There is not really any reason to be worried. All you need to do is figure out what you can do better and work on those things.
The fact that you are wondering if you should be worried tells me that you don't get something though. You don't seem to get that you could be focusing on particular things to work on to drive up your score point by point.
In your first post you talked about all the things you were going to do and read, and it sounded as if you were counting on those things to drive up your score. That only works up to a point. Reading a strategy guide and consistently doing groups of problems does give one ideas and create familiarity, but doing that does not give one intense preparation on particular things that one needs to get better at to increase one's score.
So now to increase your quant score, go back to those two tests and see what questions you got wrong and what questions you took forever to do, and figure out what you need to work on. Then deep dive into the concepts involved and do dozens of problems of the types that you need to work on until you are totally rocking with all that stuff, and obviously you will put more points on the board next time.
On good tool for doing this is a BellCurves practice account. Their quant questions can be broken down into many categories. So you can find a category to work on and do many questions in just that category. There are also other question banks that can be similarly categorized. Another way to find questions of a particular type is by doing internet searches. If you need more practice on, for instance, overlapping sets, search for that. You will find blogs about it, question sets, discussions on Beat the GMAT and other ways to get totally rocking with overlapping sets.
Similarly, go over the verbal section and note what you could be doing better. Figure out what you could have done differently to get right the RC and CR questions that you missed. Look over the SC to see what you needed to know about and to see more clearly to get more right. Then work on those topics. Figure out how to put more points on the board.
For what it's worth, in a way I don't even get why someone who speaks English pretty well and scores in the high 40's on quant would score under 40 on verbal. Ok, I get it, but my point is it doesn't have to be that way. Maybe you don't get that the verbal section is a logic and reasoning test much like the quant section. Verbal is not so complicated. Maybe you need to see that and to approach verbal in a way more like the way you approach quant. Don't accept missing verbal questions. Learn to hack your way to OAs that put points on the board.
There is no real mystery here. There's nothing to be worried about. If you want a higher score,figure out what you can change in terms of knowledge, skills, approach, timing and attitude toward the test, among other things, so that your score goes up.