What are the symptoms of seizures?

[deutsche elektronische]

I know breathing difficulties can arise during seizures. That's something I seem to be having a problem with. I have days where I feel short of breath when walking up stairs or doing moderate exercise and similar activities. Sometimes I feel like I can't take a full breath or it takes me a long time to catch my breath. The next day I will breath fine. I have had my lungs and heart checked, and my doctors can't figure out why it's happening. They think it's anxiety, but I don't feel panicky or scared when it happens. It's not a problem I have every day. I notice when I have these episodes I occasionally feel heavy, lightheaded, have visual problems or nauseated--other times I just have breathing problems. One time it happened after walking up stairs and I almost fainted. Could they be part of a seizure?