Hi and welcome,
I gather you 'may be' questioning if you actually do have MS or not... "I was diagnosed with MS in 2010. Several people in my family have been diagnosed with Lyme. All of my test came back negative including lumber puncture." ....because of having family members being dx with Lyme disease (?)
This latest MRI is only really comparing the one you had in 2014 because you already have been diagnosed with MS, from my understanding it's basically unchanged, showing no additional lesions and no old or new enhancement demonstrating you weren't under attack when you had the MRI run.
Unfortunately or fortunately depending on how you wish to look at it, MS is diagnosed by more than just the patients brain MRI evidence, i would expect that back in 2010 and since, your 'collective' evidence is consistent with MS and you don't actually have the alternative diagnostic evidence pointing away from MS as the more likely causation. Sorry but that's all i can think of at the moment, hopefully someone else can provide you with more..
Hope that helps....JJ