To specifically answer your questions:
For people with MS, relapses can last any time from 24 hours (anything less isn't "counted" as a relapse) to weeks, and longer. There is no set time (except the "not counted" if it is less than 24 hours).
You say you have "the nausea" as if "nausea" is a primary symptom of MS. It isn't. Some of us do experience nausea, if it is related to vertigo (or dizziness, which can be a symptom of MS...but can also be a symptom of a host of other disorders).
You say something about "this hug". Can you describe that more clearly? I went back and re-read your earlier posts. Sounds like you're having some spasticity, or muscle spasms? An "MS hug" is a very specific kind of muscle spasm, and I don't see anything in your posts that describes that, exactly.
What many of us with MS do about symptoms like numbness, tingling, even pain, is simply live with it. MS is, after all, a chronic and non-curable disease, and while some meds will relieve some symptoms, they won't make the symptoms go away ENTIRELY, however, and if we didn't ignore them sometimes, we'd spend all our day in a sick bed. Which of course many of us don't do. You don't know for certain that you have MS (did you get back with your doctor for the results of those blood tests?) If your pain is severe enough your doctor can give you some meds that will help it. Most of the pain meds aren't specfic to MS..that is, they're used to treat all sorts of pain, not just MS-related pain.
The "best thing to do" whether you're diagnosed or NOT diagnosed is to get meds to treat symptoms that are particularly troublesome, then go about living your life, working around the pain or disability as best you can. There really aren't any alternatives...well, there is, but that choice is unacceptable.
If you go to another neuro, it's likely he'll want to repeat all of the tests your current neuro has run. I'm a bit confused...if the neuro said you had "probable MS", and a "mild case"...have you gone back to him with new symptoms? He may change that diagnosis to "definite", and offer more specific treatment for your symptoms.
If indeed you have MS, as I've already said and Gretchen confirmed, there isn't a lot that can be done about many of the symptoms. Meds will alleviate some of them...make them less troublesome...but it's not like, "..take these pills for the next 3 weeks and you'll be well". You'll likely always experience spasticity, have some vision problems, experience vertigo from time to time, etc.
Sounds to me like you really need to go back to the neuro who diagnosed you, tell him you're still dealing with stuff and have new symptoms, and ask, "Where do we go from here?"
I am so glad you are going to another doctor. I think a second opinion is definitely warranted. I hope you get some answers and some relief real soon. Keep us posted.
Love and prayers,