It sounds a little hard to distinguish between the waking episodes and the dream episodes but either way they're quite similar and don't worry, none of this is abnormal nor some type of seizure. If this is a waking experience then it is most definitely sleep paralysis. During sleep paralysis (SP, for short) your body may feel heavy and you will often experience an inability to move though if you try to move you'll probably be able to (it's difficult to describe). Basically if you really want to move, you can. However, during SP hypnogogic hallucinations are very common and encompass all the senses though mainly sight and sound. A common form of this is a feeling of movement or vibrations, often described as floating a bit or limbs flailing despite the person being completely still. These are all hallucinations and are all completely natural, you have no reason to be afraid of them.

SP is often a scary experience when you don't know what it is and can still be a little spooky once you learn what it is but if you do choose to attempt lucid dreaming you'll be glad you have an easy time entering it/have experience with it. SP is a very common step in WILD (wake induced lucid dreaming) and from SP one can easily enter a dream without losing consciousness, becoming lucid. If you just accept all these occurrences and maintain the right balance of consciousness then a dream will likely start to form around and out of your hallucinations. You can then use this to do whatever you want.

Everything you've described is common dream phenomena especially when attempting lucid dreams. You shouldn't fear them at all and they can often be quite enjoyable just observing all the different things you brain can do. At worst it's a bad dream which you can easily combat with lucid dreaming; at best it's an excellent way to become lucid and you're lucky for having it happen to you (bet you weren't expecting anyone to call you lucky based on that story, huh? )