@gamerabbit, your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advise on) your project 
See About the Installation & Troubleshooting category.
You have reached the limitations of the Nano, either because you haven't optimised your code yet or because you really have reached it. You can add devices to store data but it will never be the same as the RAM as that you currently use.
When posting code, please don't forget to use so-called code tags so the forum software does not mangle it, it's easier to read andeasy for others to copy; use the </> as shown below.
