Hi Sammy - I too started with slurred speech and it was rather variable. I had good days and bad days with it, and even sometimes from hour to hour it would seem to vary in quality.
You have had a lot of tests but if you haven't had an EMG yet, as other as have said here you should definitely have one. It is premature for the neurologist to say "probable
ALS" without such testing. Some doctors tend to jump the gun on those opinions.
I know it is hard when you have the possibility of
ALS in the picture. But there is still good reason for hope, there are many different things that can cause these kinds of symptoms. And even if you get the bad news of an
ALS diagnosis, all hope is not lost. These forums have been a lifeline for me, reading the many positive and encouraging thoughts from people who are handling this disease with such strength and poise. But you are not there yet, there will be plenty of time for dealing with bad news if it comes. Right now you should focus on the hope for good news, continue to enjoy life and do the things that bring happiness.