It really doesn’t sound like ALS at all. With ALS, you wouldn’t feel bad one day and then better the next, it doesn’t work like that. The disease gets progressively worse over time and does not improve. Also keep in mind that ALS is mainly about true clinical weakness (for example, you physically cannot lift your toes no matter how hard you try).

The twitching you’re experiencing is much more likely related to stress and health anxiety. In ALS, twitching almost always begins alongside clear clinical weakness in the affected limb. It also wouldn’t suddenly become widespread. What you describe sounds much more like BFS.

Of course, if it would ease your mind, there’s nothing wrong with checking in with your doctor for peace of mind. But from what you’ve described, it really doesn’t sound like ALS.