I know how nerve-wracking these doctors appointments can be, and I have also questioned my sanity at times during this process. It can be so frustrating and scary to have the hope for an answer hang on one long-anticipated visit. However, it is definitely worth going. Even if you don’t get a diagnosis at your appointment, the neuro might be able to see some of the issues going on (i.e. the tremors or the weakness on your right side) and they will be noted in your medical record. This could then shape the direction of future testing, help eliminate certain diagnoses, and ultimately lead to some answers.
By the way, I also get the visible muscles tremors and the heavy feeling. I think mine are part of my fatigue.
Hang in there, you will get through this.