Try not to get too anxious. It could be a long time before you get any answers. With MS, if the tests don't line up just right, then you are put into a "wait and watch" situation. There is no one definitive test. MS is a great mimic and everything has to be ruled out. For me, there were these horrendous symptoms (I was actually in the hospital unable to walk), and then there were some "spots on my brain". They had to do months of tests before MS was the conclusion. Before that, I heard MS, lyme disease, stroke, HIV/AIDS, meningitis, brain cancer/tumor, ideopathic brain infection and others. The MS meds are very expensive and they are all currently injections (except for a new pill) you give yourself daily, several times a week or once a week. Doctors are not quick to diagnose MS for those reasons.
Meanwhile, get that marvelous GP to treat some of your symptoms so you can carry on! Also, you may want to line up a neurologist for this. I would recommend an MS specialist. The local MS society can give you a list of MS specialists in your area. Just google National MS society and their website will help you find a local chapter. I went from a hospital assigned GP, to a hospital assigned neurologist to an MS specialist neurologist. Also, get to work on changing any negative lifestyle habits. Eat well! Lose weight if you need to. Stop smoking if you do. And work on daily exercise. These are the things that really made a difference for me.
If you do get an MRI, be sure you get your own copy of the CD and the written report. You will want this to get to your neurologist and hand carrying it may be the best way.
Sheesh........sorry this is so long! I hope you stayed awake through all of this!