Hello, I'm sorry to hear you are having a hard time. A few years ago I worried about ALS, for me it actually started with the twitching all over my body. I can guarantee that twitching in ALS only happens when your muscles are atrophied. This means that you pretty much don't have any use of your muscles, which is not the case here. The weakness you said you noticed, is it something you feel? If it is let me tell you that I had the same issue with my legs first, I felt the weakness in my legs and they were shaky when I would even walk. I felt that my legs where jelly...lol But with ALS you don't feel weakness, it just happens. You probably can't curl the same weight because you said you stopped going to the gym. Same thing with me, I actually stopped going for about 4-5 weeks and let me tell you I felt the difference. I couldn't lift as much as I could and this aggravated my anxiety. Go see your doctor and tell him your concerns, I did that myself and It took me a while to get over my fear, but eventually I did. And so will you...keep me posted on how you feel, If you have any questions about how you feel let me know. I had the fear of ALS for a while and learned quite a bit about how anxiety can mimic this horrible disease. Keep me posted!!!