Hi venus,
You haven’t mentioned anything about whether your mattress is too soft or too firm but based on your comments I suspect that it may be firmer than you prefer and if this is the case some of the suggestions in post #2 here may be helpful.
There is more about the more common symptoms that people may experience on a mattress and some of the most likely reasons for them in post #2 here that may be helpful as well.
The best suggestion I would normally have for the first few weeks is to do nothing (other than the suggestions in the previous link and of course talking with Mattressmakers about any suggestions they may have as well) while the mattress breaks in and you adjust to the feel of a new sleeping surface because what your mattress feels like to you in a few weeks may be quite different from what it feels like when it’s brand new.
The partial specs of another mattress won’t help you to choose a topper for your mattress because they are completely different from yours and it’s not really possible to use the specs of one mattress to guess at the type of topper that would work best on another mattress that has a completely different design but if after sleeping on your mattress for a few weeks you decide that adding a topper is the direction that you think would be best (after discussing your options with Mattressmakers) then the post I linked also includes a link to some guidelines that can help you use your sleeping experience on your mattress as a reference point for choosing the type, thickness, and firmness for a topper that would have the best chance of being a good “match” for you.
Phoenix