This sequence of events is not typical for ALS
Tremor is not a usual ALS symptom, and if it does appear it is usually late in the course. The normal EMG also speaks against ALS. Sensory complaints like pins and needles are very unusual for ALS, as this disease affects the MOTOR neurons.
The sequence of events, depending on the subtype of ALS, is usually weakness, wasting and fasciculations/cramps of one limb spreading to other limbs or swallowing muscles. Certain types can present with the swallowing muscles first, or muscle weakness or spasticity first.
Maybe if you are not getting any answers and your tests are normal, you should be reassured rather than more anxious that you do not have a diagnosis of a neurological disease
Over the internet I cannot give you the all clear as I have not seen you or your tests, but address you worries with your neurologist or your family physician. Also, as you will soon learn at MedSchool, time is an excellent diagnostic tool
Other diagnostic considerations are thyroid dysfunction, inner ear pronlems (benign paroxysmal vertigo) or essestial/physiological tremor.
Good luck
If you aren't satisfied with the care, testing, or treatment you are given by ANY doctor--find another one.
Of course obsessing and worrying about every symptom you have will magnify it. What you need to do is to get competent advice from a doctor you trust. Hopefully the doc here can give you some reassurance, but he/she cannot substitute for medical care provided in person.
You will find as you go through your medical studies, that you will develop symptoms of almost every disease known to mankind. Goes with the territory.
Good luck.
In these cases, I suspect it is caused by 2-butoxyethanol. Many times you can pinpoint having 'flu-like- symptoms when it isn't the flu ... possible burning eyes, urine turning dark ... or you could have a parent with such and be getting just a singular or only a few symptoms (not full blown ... but sort of like a 'birth defect' that can show up later)
2-butoxyetanol is a teratogen. So, based on knowing well what this chemical does, I suspect it for quite a few things www.valdezlink.com/acute.htm If doctors studied any chemical, they should study this one
http://home.gci.net/~blessing/pages/flu.htm
Why I looked into this chemical's harm
http://home.gci.net/~blessing/pages/who.htm