look, someone told you that he knew someone whose dad...
how do you know this report was correct? How do you know that the pain this remote person had experienced (If any) was the same as yours?
In terms of histopathology people who suffer ALS have degeneration of neurons in the motor cortex and in the anterior horns of the spine. In the first case they have so called spastic paralysis (like in stroke), so if this comes first, the pain is possible, but it is spastic pain, and the whole limb shows severe rigidity which one can not miss. However most often the disease starts with spinal neurons destruction, and in this case it is a weak paralysis (paresis) which is not painful, and just implies a foot drop.
One can expect a foot pain as a result of 4-5 workouts in a week, really. Some slight trauma which you decided not to care about, or new sport shoes with improper soles, or increased load, or just new excercise - and your tendons become inflammed, and this causes pain - first only during workouts or after, and then it becomes continous, and the whole leg suffers and becomes "stiff' becasue all muscles are tensed in a wrong way. This pain tends to continue until foot position would be corrected or until trauma would be healed.
Have you had any medical investigation of your foot? Any Xray (pain might be caused by crack in one of the dozens of small bones it consists of), ultrasound to check tendons, etc?
As for how to stop twitching, according to the experience I got from three years of my own twitching is - there is no way to stop them. Once you get twitching, you will continue having them occasionally here and there (as you may probably have had before and just did not give any notice). Practically the only way is just to live with them
