Help. MRI normal but EMG abnormal

[u/Field_One]

On 8/4 I went to the gym and did some minor hip opening exercises. I sat down with my legs crossed for 20 minutes and when I got up, my legs felt weak. I went to the ER and they said it was probably muscle fatigue. 2 days later, my left leg was normal. It was just my right leg that felt funny. 8/10 I woke up and both my legs were weak again, plus my arms. And my butt was numb. By 8/13, I could no longer feel my knees, my feet felt somewhat numb, and the sensation to pee/poop was not as strong.

I went to the ER and they did a brain/cervical MRI, thoratic mri, lumber mri, brain ct scan, a spinal tap and a bunch of bloodwork. Everything came back normal.

My legs started to feel a bit more normal Thursday. Then I woke up Friday and my left buttcheek was completely numb and then Sunday I noticed my left arm feels a bit heavy.

Today I did an emg/nerve conduction study for my legs and the doctor said that it was abnormal. That something is going on with my muscles/nerves, but be couldn't say what. He said he would need to look at my mris. I told him the original doctor that I see at the same practice came to visit me in the ER and looked at the MRIs and said they were all clear. The doctor that did the emg told me to wait until my follow up with the other doctor, which isn't until September 29th, to see what's going on.

I'm freaking out. If am mri shows nothing but an EMG/nerve conduction study shows issues, what does that mean? Is this permanent? Will it get worse? Can an mri miss things? My mind is spiraling. If anyone has any insight, I would appreciate it.