Sometimes waiting is the only thing one can do. Because all your symptoms and tests...my goodness you got all those tests done quite efficiently...were in a small period of time it is hard to know for your doctors if this is just a result of the virus that will get better with time.
As for your EMG...it was clean! That is wonderful and should be pointing you away from ALS...not to it. And no, it is not too early to tell because problems will show up on your EMG even before symptoms begin ..and you had symptoms before you got the EMG...so that is not it.
Give your body some time to recuperate from whatever attacked you in the first place. It sometimes takes months for a full virus to get out of your symptom. In the mean time, if you are really bugged with the lack of running, ask your GP for a visit to a P.T. for evaluation and therapy.
Try and relax, and wait for the next appointment when it comes. If you are better..great! Problem solved...if not, your specialists will start to order the appropriate tests and you can ask more ?s then