The thing is, I know I'm not imagining my symptoms, I'm pretty sure they're real.
As WendyWooG replied, 'no one is saying that your symptoms are imagined or not real';
And as Atsugi said, 'I think it's not a good idea to answer. Some people subconsciously "get" the symptoms they hear about'.
These symptoms are, or can be, very real.
That does not mean that they are not a product of our fears.
A psychosomatic illness is very real; the symptoms are very real; they are not 'made up'.
But they are a product of our stresses and our fears.
Our body reacts to physical stresses and pain in very overt and obvious ways.
Our mind reacts to stress, emotional pain, and information overloads in sometimes very mysterious ways.
When we hit our thumb, a nerve sends the signal to our brain and we instantly feel the pain. Our body then reacts with whatever reaction we may have, such as shaking it, squeezing it, ...whatever we do to try to alleviate the pain.
Then, the pain fades.
Was it our reaction that made the pain fade?
No, probably not.
It was our mind believing that whatever we are doing is making a difference and our mind is soothing the pain.
Does that mean the pain was not real in the first place?
Of course it was real; but all that the pain was in the first place was a signal to our brain that said that it should hurt.
Once we convince our brain that it should feel better.... so we do, even though there is no real reason that it should.
We believe that we are getting some terrible disease.
Our stress rises.
Soon we are noticing every little symptom and our brain starts to believe that they are indicating to us that our fears are real... thus increasing whatever symptom is bothering us, feeding the stress.
Are your symptoms real?
Of course they are.
Are they ALS?
You have been assured by many knowledgeable people, including your doctor, that they are not.
Earlier you mentioned an EMG... By all means, if they are willing and if it will give you peace of mind.