as per gcoe, have you been diagnosed through ultrasound? color doppler ultrasound can be used to acscertain the degree of neovascularisation. a good sports doc can set you up with these.
have you given alfredsons protocol enough time, he advocates between 6-12 weeks of eccentric drops? do you perform maintenance eccentric strengthening during the times that you have been painfree?
there is level 2 evidence to support the use of nitric oxide donor therapy and in most up to date protocols this is the next step following on from unsuccessful eccentric strengthening. this is used in conjunction with the continuation of heel drops.
also sclerosing injections have shown positive results in small scale studies when used to treat areas of neovascularisation.
for the above two treatments you need to be under a sports doc. in your neck of the woods you shouldnt have too much trouble finding someone aware of the above treatments. here in ireland however...... i've only come across one doc who has even heard of sclerosing injections!
biomechanical assessment and treatment of soft tissue abnormalities is also nb.