Contrast does not matter. It’s only useful for distinguishing between active and historic lesions in people who do have lesions, but it doesn’t reveal any lesions that couldn’t be seen without - so if you don’t have lesions visible without contrast, you wouldn’t have any with it, either.
As to whether your symptoms “sound like” MS, that is probably one of the commonest questions we (diagnosed people) get asked, but one of the hardest to answer. Yes, in the sense your symptoms are all things a person with MS might get - there’s nothing that sounds really unlikely, or even impossible. And yet no, in the sense that over 100 conditions can cause similar symptoms. I’ve absolutely no way of knowing if your symptoms are related to MS, or one of the 100+ other things. As far as I know, MS has no unique symptoms that are never caused by anything else. If it did, diagnosis would be so much easier.
A clear MRI is not concrete proof you couldn’t possibly have MS (no test is), but in general, the longer you’ve had symptoms, the more likely it is something would show on MRI. In other words, it can’t “hide” forever - damage may evade detection in the early stages, but eventually, something would show.
So if you had the last MRI at least six months ago, it may be worth angling for another, just in case anything has changed. If, however, you had it more recently, it’s probably not worth pushing for another so soon - there has to be enough time to allow for changes. If you scan too closely in succession, you’ll just get the same result - except, occasionally, if there has been a major increase in symptoms, which could hint there would now be something to see!
Unfortunately, MS is notoriously difficult to diagnose, and is also a diagnosis of exclusion - which means it’s last on the list after every other explanation has been ruled out. This can make diagnosis extremely slow.
All I can tell you is that I do have a firm belief the truth will out - if you have MS, that is. I believe I’d been ill for years, before the chain of events that finally led to my diagnosis. I didn’t even feel surprised. It was more like: “So that’s what it was!”