An EMG test that is clean after you have started to experience your symptoms almost certainly rules out ALS. By the time you experience even slight symptoms from ALS, the disease has already severly damaged your neurons and an abnormal EMG would show this damage. You should continue to search for answers to your symptoms but do so without the fear of wonder about ALS. Good Luck........
When I had an EMG I asked if it could have been too early and the ALS specialist said no. I know that when symptoms are still there afterward then it can put doubt in your mind. I have heard that anxiety can play a large role in symptoms such as perceived weakness and even slight speech issues.
I recommend that if you have had a clean EMG then I would perhaps think that it could be a benign condition called 'Benign Fasciculation Syndrome'. Search for AboutBFS and it will lead to a great forum of people just like you who have had a clean EMG and have been told that they are fine but still have twitching and a variety of other symptoms. You may find someone there that has been cleared that has similar symptoms to you.
I had similar issues, but my neuro said that a clean EMG is pretty much the "gold" standard for MND, and that if there are no abnormalities on that, you are good to go. Not that it makes me feel better when I have the same problem, but he seemed pretty confident that if you had symptoms, then the exam and emg would pick them up.
I look forward to hearing of some answers you get, because I wonderthe same thing.