Really scared

Hi, I've had fasciculations for 2 months,at first it was mostly in my left foot and I had it for 3 weeks and than it stopped. I didn’t have fasciculations for 2 weeks,then it came back but now my twitching is body wide so everywhere.7 days ago I started having a new symptom of tightness in my knee, which is sometimes in the whole leg, I'm 20 years old and I'm really afraid that this is als.Considering that the fasciculations started 2 months ago, I think it's too early to do emg and this uncertainty is killing me, I did mri and it was normal.my question is whether this tightness in the knee or leg is something to worry about, thanks in advance.🫶🏻