Yes, it most certainly can be something else.
The twitching in the calves has stayed just that . . . twitching with no weakness. That is the definition of BFS.
The pain in the shoulder area can be a gazillion different things. For example: my guess is that you're in front of your computer all day, either working or frantically researching
ALS on the internet. This doesn't do your posture any good and can certainly cause shoulder problems. The twitching and "abnormal" EMG (I'm still waiting for you to post the results) in that area could be an irritated nerve due to your above problems. As Robert just said, if that is the only place there were any abnormalities . . . or if that is the only place your neuro EMG'd you, then it is MUCH too premature to speculate about your condition.
Furthermore, a few beats of clonus is considered normal. Once it gets beyond 5, it is considered patholophysiolgical. Hyper-reflexes and Hoffman (especially if they are symmetrically found on both sides of the body) can be due to anxiety or just simply the way you are.
Listen Bart, we know you're frightened but bottom line: you have not been diagnosed with a single thing. Your attitude should be . . . "prove to me that I have
ALS" . . . instead of . . . "prove to me that I don't have
ALS."
I wish you peace.