I'm a little confused as to why you have stiffness if you don't have arthritis -- any ideas? Perhaps they said you don't have rheumatoid arthritis. At any rate, there are so many remedies for joint inflammation -- MSM, chondroiton and glucosamine sulfate, proteolytic enzymes such as bromelain, quercitin, vitamin C, ginger, turmeric, boswellia, devil's claw, yucca -- I mean, the list is very long. Perhaps the best thing is to buy a good book on natural treatment of this problem since there are so many combinations of options to choose from.
I'd try magnesium, acidophillus and magnet therapy