Hi Green Life,
Most pain is due to a build up of toxins either in the afflicted area or throughout the entire system. The other cause is injury. Being the pain is after sitting it most likely toxins, and could be helped in two ways.
One - move more.
The circulatory system has the heart pumping blood to the cells 24/7. The lymph system, which carries the waste from the cells, is larger than the circulatory system and has no pump. The only way it moves is if we move. Walking some every day and increasing to maybe an hour a day is very good exercise for the lymph system.
Skin brushing is also good. There is an excellent article on another website about skin brushing. I'll find it and post the link here for you. This is something that can be done for a few minutes before your bath and some have had tremendous results.
The second thing is to increase your water intake. No matter how much water you are now drinking it is not enough. Otherwise your toxins would be flushed from the system and no pain. We need an ounce of water for every two pounds of weight every single day. Raw foodists who eat only high water foods such as fruit, veggies, and greens get some of the needed water through food. Most do not eat that way and need to drink their water.
So these two things are free or at least fairly inexpensive even if the water is bought by the gallon. Please try them, they have amazing results.