Doesn't sound like MS at all. Sounds like straight up anxiety. How do I know? Because I've had your symptoms and many more.
Here are two posts I made a few weeks ago when I went to see a neurologist.
"I passed my strength test, reflex, and coordination test, and the symptoms that I told him I had didn't seem to concern him. Said symptoms of MS don't come and go through out the day, and last for weeks, not a few minutes.. Just like many of you guys told me. He said by everything hes gathered he is very doubtful that I have MS. Said anxiety can cause every symptom I have, because anxiety depletes vitamin reserves, and messes with your bodies P H. For the others who think they have MS, my symptoms are tingling, numbness, burning sensations, and muscle twitches.. I've also had days where I THOUGHT I was off balance and weak.... Obviously I was wrong.. On the topic of muscle twitches, my neuro said that they are not the sign of early on MS, and come on many years after a diagnosis."
"I have just recently went through my MS scare.. Saw a neuro and had a battery of tests and turned out I was okay.. You really got to try and trust the doctors, they are the ones who went to medical school, not you.. The MRI is telling. There would be lesions if you had MS. My symptoms were.. buzzing of the feet, numbness, eye problems (visual snow), feeling off balance, perceived weakness, muscle twitches, joint pain, etc.. The neuro literally tested for MS, and every other autoimmune disorder, and lyme disease, and for diabetes, b12 deficiency, and it turned out not only did I not have anything (thank god) I was actually very healthy. You're healthy too. Once I accepted it was anxiety my symptoms have all but gone away. Best of luck. "
Stress can cause a lot of physical symptoms..
As for floaters.. they are very common and do not indicate any kind of problem. I have had them since I have been a little kid and have read scientific articles that claimed that the majority of people have them. Most people don't see them because our brains automatically hide them but for people who suffer from anxiety we are hyper aware and notice what our brains naturally tune out.
MS and ALS are very popular fears for anxiety prone people. They are diseases that make people lose control of their bodies.. This is a very scary thing, which is why so many of us worry about it. It doesn't help that the physical symptoms of anxiety closely relate to those of neurological disorders..
But as for ALS. It is literally impossible that you have ALS. Your age makes it statistically impossible essentially.. The chances of you having it are similar to your chances of being struck by lightening. 99 percent of the time it is people over the age of 55 who get ALS.. Also ALS does not come on slowly.. it is a fast moving progressive disease.. you would literally be so weak you wouldn't be able to pick up a piece of paper (seriously), and it only get worse from there. You would not think something is wrong, you would know.
Back to leg twitching.. mine is doing right now.. I have had it my whole life essentially. Docs rule it completely benign and anxiety/stress induced..
Here are some threads that might help you:
100 Anxiety Symptoms:http://www.anxietyzone.com/index.php/topic,17050.0/topicseen.html
A Thread for Newcomers Worried about Multiple Sclerosishttp://www.anxietyzone.com/index.php/topic,9832.0.html
best of luck
You will learn in time that your mind is a very powerful thing and can make you feel sick, even when you're not.