I have similar stuff happening and went to a Nuerologist and I am getting testing to ID the issue. I am in the middle of testing now. You should probably see a Nuerologist to pinpoint the problem. But, if you had the symptoms for over 2 years then ALS is pretty much out of the question since ALS sympoms come on fast typically within 2 months and you are well into the bad stuff within 6-8 months. There are many many nuerological disorders and most have these strange symptoms that are not debilitating at young ages, if not ever. I was also freaked about ALS and the other deadly motor diseases - I fell more calm not but still not 100% OK until the doctor finishes the testing.
If the doc says it is most likely Carpal Tunnel, then it is most likely Carpal Tunnel. Carpal Tunnel is very common and ALS is extremely rare, almost unheard of in anyone under 40.
I remember now when my left hand went numb on me for the first time, I thought I had had a stroke and went straight down to emergency, the dx came back as Carpal Tunnel, sure enought that was eventually confirmed by nerve conduction tests.