Hi - it sounds to me like you have Ehlers-Danlos or joint hypermobility syndrome. I don't understand why you are calling BS on a diagnosis of Ehlers-Danlos, unless that's down to having a mistrust of doctors, in which case I thoroughly sympathise.
I have hypermobile joints, scoring 8 on the Beighton scale. I haven't been officially diagnosed with Ehlers-Danlos yet and I don't fit any of the major classified types. I have the finger joint symptoms like you - my hands, wrists and ankles are the worst affected. I also have tennis elbow and pains in my knee joints when standing up quickly from a crouching position.
If you worry too much that's another sign of Ehlers-Danlos, as it's associated with anxiety disorder.
Anyway, welcome to the forum. I hope you find what you are looking for.
F 5 ft 3. HW: 196 lbs. Primal SW (May 2011): 182 lbs (42% BF)... W June '12: 160 lbs (29% BF) (UK size 12, US size 8). GW: ~24% BF - have ditched the scales til I fit into a pair of UK size 10 bootcut jeans. Currently aligning towards 'The Perfect Health Diet' having swapped some fat for potatoes.