Hi and welcome Dane
there are so many kinds of reasons for the symptoms you describe that annoying as it is, the wait for the neuro appt is probably necessary to get the tests you need to be clear re what is going on.
there are a variety of proactive nutritional approaches you could start on in a light way, while you wait.
for starters you can analyze your diet and lifestyle to see if it could impact nutrient status in ways that lead to illness. ms has a well studied catalogue of imbalances that unfortunately tend to get ignored in the mainstream with the possible exception of vit b12 and vit d3.
i would think that for starters wrt to pain and spasm and breathing difficulty, you might consider looking at your daily intakes of magnesium in milligrams, and try to aim for 400mg daily mag every day.
anyway. lots of info and support here. again, welcome.
my approach: no meds so far - just nutrient-dense anti-inflammatory whole foods, and supplements where needed
info: www.whfoods.com, www.nutritiondata.com