Since no one has decided to help, here:
I don't know how good your maths is or how much you like/dislike it but engineering mathematics is not "mind melting".
Engineers are taught maths so that they are able to understand how maths applies to engineering.
Engineers are not savage beasts who live in caves. We do not solve the bulk of our mathematical problems by hand. Leave that to the physicists and mathematicians, the rest of us will use MATLAB.
Any maths you solve by hand will, likely, be for teaching purposes and because it is hand solvable its difficulty will be limited. Some people will struggle, as is natural, but overall it is passable if you put in the work. This book is very helpful for transitioning into engineering maths, it's pretty much AS Level maths through to elementary engineering maths. It does require you, at least, have some basic mathematical ability and it does rely on faith of the student in some areas where it doesn't explain why something works, which is fine at your level.
Ultimately, you will be better off taking civil engineering and going into a quantity surveying job or master's at the end if you still have the desire. You will have many more employment options this way.
If doing the civil engineering foundation year helps you get your head around/build you up to the maths, then do that.
If you do this and find that you can't handle civil, then transfer over to quantity surveying. Better to try first rather than give up before you start.