I have throbbing 24/7, constant
IT'S THE COMPRESSION TELLING YOU OUCH
Think of it like a crimped hose with water just trickling out.
Thats what your system is going through
The nervous system is being compressed along with your circulatory system.

When I start using my hands and arms it increases
When I try to reach, grasp, etc it increases
Heat, the weather and stress increases throbbing
Sitting or standing for more than 10 minutes increases throbbing
What doesn't increase throbbing in my case.

things you can do
1. LAY ON THE FLOOR ON YOUR BACK AND OPEN THE BP
2. Subtle movements like Feldenkrais
3. Exercise your spine so its like a dolphin
4. O gravity chairs