Hey I have heard that MSM (methyl sulfonyl methane) is helpful for relieving joint pain, personally haven't tried it but see if it can help you?
Got this description from the web:
"MSM is a chemical found in plants, animals, and humans. It can also be made in a laboratory. People use it as a medicine.
MSM is used for chronic pain, osteoarthritis, joint inflammation, rheumatoid arthritis, osteoporosis, bursitis, tendonitis, tenosynovitis, musculoskeletal pain, muscle cramps, scleroderma, scar tissue, stretch marks, hair loss, wrinkles, protection against sun/wind burn, eye inflammation, oral hygiene, periodontal disease, wounds, cuts, and abrasions/accelerated wound healing. It is either taken by mouth or applied to the skin for these uses..."
It shouldn't be expensive coz I have seen it in those vitamin shops before.