Imaging such as a CT Scan or MRI are not indicated unless there are some extreme symptoms such as would be common to a stroke or such. They will not show anything except in rare situations. There is a type of MRI called Diffusion Tensored Imaging that can show the microscopic damage in some people. But, even DTI's do not change the treatment.

Doctors use them to rule out rare but serious issues. Insurance companies have yet to put a slow down to these expensive and intrusive (CT Scans have the same radiation levels as 60 to 200 X-rays) procedures.

It sounds like you are improving so further diagnostics would not be much value.