natscoolma,

Sounds odd. Sorry to hear of your continuing struggles.

Have you tried to track all of the other characteristics that precede these events?

Like,
What were you doing while you were sitting?
What kind of stimulation was going on around you?
watching TV, reading, music, Christmas lights, Christmas lights blinking, thought processes, muscle tension, perception of time slowing down or speeding up, a passage of time (absence seizure),

You will be the key to collecting the important information.

I get these feeling of my head feeling heavy but they go with my eyelids feeling heavy. All of a sudden, I feel like I have to go to sleep. Sometimes, I just go out.

Have you read the thread about upper cervical chiropractic? The cervical nerves could be an issue to look into.

Sometimes, it takes a second person to witness these events and report what they have observed. Wish I could help more.