Is there an optimum number that you ought to have under your bed?
Les Brown in his book 'The Pyramid' recommends a group of 20 pyramids to form a rectangular matrix.
I don't understand why he would choose a rectangle when the original shape is a square? He doesn't explain his thinking behind this decision so my personal feeling is that 25 is a good number. This makes a square and is around the same size as the width of the human body, so ideal for placement under a bed.
Awesome that you were able to feel the energy swirling out of the top! Brown tells us that 80% of a pyramid shape's energy is released from the apex. The rest from the four base corners. It doesn't matter what the material is, the shape alone is very powerful.
People tend to feel sick (like they want to vomit) when the pyramid is over 5 feet and not correctly grounded (with metal rods going into the earth directly under the pyramid). You must be extra susceptible to the energy it gives off if you felt this when it was so small. Though I suspect the red jasper crystal amplified the energy in your room. For your info the energy is great for us, even when it makes us feel sick. It's just that the human body doesn't know how to react when it is first in contact with it. Over time we become accustomed. Or we figure out how to correctly ground our pyramids.
I created my first grounding base just today (in the entrance hole for the ex-greenhouse), ready to fill it with soil and put a wooden pyramid over the top. I will write a post about this at some point but it's basically just scrap metal in a hole.
This provides a good mechanism for moving the energy naturally into the earth from the pyramid, permitting plants & humans to thrive in there without feeling sick.
You could always try Yannick's website for pyramid frames? Don't know what his overseas delivery costs are but the frames themselves are decent enough, though perhaps a bit thin for my taste.