Dear hev,
I'm sorry that you're going through this very confusing and stressful process. So many of us have experienced what you are describing on the way to a diagnosis.
Part of the reason is because MS is hard to diagnose and other conditions must be ruled out. The diagnosis is grounded in clinical evidence and confirmed by MRIs, an LP, and EPTs. Many neurologists adopt a "wait-and-see" approach when the patient shows symptoms but hasn't fulfilled all the criteria for a dx.
The sensory symptoms you describe: numbness, tingling, vibrations, odd and hard-to-describe sensations are typical of MS, most of us have all of that. Generally there are no medications for most of these, however, a drug such as gabapentin is often prescribed when sensations become painful. You can discuss symptom medications with the neurologist.
Leg heaviness/weakness is also a common symptom of MS and is often accompanied by fatigue. It can get worse with heat and activity and return to baseline by cooling off and resting. These symptoms are very hard to treat. Fatigue can be treated with drugs such as antidepressants, ritalin, Provigil/Nuvigil, amantadine, but not everyone is helped by these. A new drug called Ampyra is designed to help people walk faster and more easily, but you won't know whether it helps until you try it. Unfortunately, limb disability is a ubiquitous outcome of this disease and we cope by making adjustments to our lifestyles.
I've experienced ringing in the ears and other auditory symptoms such as hearing loss in the past, and these can be MS-related--though your doctor may deny that it is. Inflammation in a cranial nerve that affects hearing can be responsible for these sensations. As far as I know, there is no treatment for this. In my case, it resolved after a couple of weeks.
I hope you'll let us know the results of your new neurologist appointment. Please come back often with questions and for support any time you need it.
Kim