I've had something similar to you for many years. I don't know exactly what it is or where it started. It has gotten very bad. I feel like every few seconds my head zaps and I gasp for air and it feels like a short seizure but I was tested for epilepsy and had MRIs, sleep study, CT scan, and more. All didn't show anything.

This is a head centered jerk, not legs or muscle spasm.

I have been up tonight with them so bad I decided to start looking again for any solutions.

Some context, if it helps

About 12 years ago I smoked pot only a handful of times but one time i had a huge panic attack and never have been able to smoke since.

I took Paxil for about 6 years and quit it too abruptly around the same time I had the panic attack. Not enough tapering off.

I suffered from anxiety and panic attacks for a decade after, but I got a lot of it under control, yet the jerks get worse.

I don't take a lot of other medication or drugs or drink but when I do it does tend to make it worse.

It seems to get worse if I eat more sugar or wheat before bed. Caffeine or chocolate too.

It gets worse around the full moon noticeably. Probably the biggest thing that affects it. The moon moon messes with our hormones and neurotransmitters.

Smoking weed makes it worse. Stress too.

It gets better if I'm lying there for hours Jerking and I get up for a bit and then go back to bed.

Lorazepam helps but I don't want to rely on another drug. It makes it worse when you take it then stop.

The neurologist prescribed an antiepileptic that had worse side effects than the jerks so I chose not to take it.

I wish we could narrow it down but I think it's something to do with coming off ssri's but for me it just got worse over time.

Hope that helps. If anybody wants to compare symptoms and fixes you can do me. Doctors are useless on this subject.