Anyone experiencing one sided muscle weakness?

My right arm and right leg have been feeling so weak lately. It started with my right arm feeling slightly weaker for months, and then 2 weeks ago when I pushed myself (read:put away groceries) my arm and leg have been feeling so weak, heavy, and like I'm weighed down by lead. I thought it might just be PEM, but they are still feeling like this 2 weeks later. I can barely hold my phone for more than a few minutes. I also developed a warm burning sensation in my right inner thigh 3 days ago. I tried stretching, but the sensation got even worse. I went to urgent care last night to make sure it wasn't a blood clot. My leg ultrasound and blood work was all clear. As always, the ECG showed Tachycardia (I have POTS, CFS and severe insomnia). Anyway, after pushing myself for hours yesterday at urgent care, I've crashed today and my muscle weakness is even worse. I also have full body tremors.

I had an EEG and EMG back in October and my neurologist said it was fine. But I'm deteriorating and getting worse.

It sucks because my right side is my dominant side, so I can barely do anything like brushing teeth, washing face, eating, brushing hair without making it feel worse. Is anyone else experiencing this? What has helped you?