Seizure or something else?

I had my first seizure (tonic clonic) about a week ago and since then have seen a neurologist. Last night I started to feel strange and anxious and my breathing was irregular, I got scared and thought maybe another seizure was coming, all that happened was my thighs and body started shaking and like spasming. I was kind of getting ready for bed so I just tried to call my breathing and fall asleep, there was a feeling when I was laying almost like when you're falling asleep and you wake up like you're falling. I don't think I was falling asleep though because the muscle spasms were so intense there was no way. I felt so anxious and I'm wondering if this is a different kind of seizure or even a panic attack. I have an EEG tomorrow so I'm hoping that tells me more but I would really appreciate any input, thank you!