Mom hasn't been able to sleep and is affecting her physically now

I got told to post here, thank you!

My Mom (54F) hasn't been able to sleep properly for about a year now, but it has gotten worse lately.

She's around 185lbs/83kg

5'9 / 1.75 tall

I believe she's taking something for her cholesterol.

Doesn't smoke or drink, never has

She would be walking around the house in the middle of the night, doing chores, exercise, showering, or going outside for a walk, everything for the sake of getting tired, but it gets to a point where it's 9 am and she hasn't slept at ALL.

She went to different doctors and they either told her it was anxiety, or gave her pills to sleep, but they don't work, nothing works. She says she tries to take a pill, but it just leaves her acting like some sort of zombie, doesn't sleep, just- stand there, swaying from side to side, sometimes shivering, sometimes she goes out and stands too close to the road and does the same thing, just staring, swaying, hugging herself.

Sometimes she would be walking down the hallway and just slam herself against the walls or my door, and when I ask her about it the next day, she says she was just trying to find her room.

I've done my own research, trying to find anything, and i mean ANYTHING to get her to sleep well for at least once; incense, candles, vitamins, massages, teas, a melatonin gummy, and nothing works. We truly cannot afford to go to the doctor and have them make a hundred tests to see what's wrong, she refuses to try other pills due to reviews on the internet- I'm just so lost on what to do.

She says that sometimes she'll just go to the bathroom and vomit, an that it's the only thing that helps her sleep.

Also, both during the day & night she would get some sort of tremors, as in, her hand would start moving, her legs would start shaking- she says it stops her from sleeping also.

What can I possibly do?