I agree with the others. Electrical stimulation can be good to reduce your pain levels but it is ignoring the underlying problem.

Also platelet injection around the area can be helpful in certain situations - if it isn't responding well to conservative treatment.

Extraction of your own blood, then re-injected around the tendon with a little bit of local anaesthetic to take the edge off. Helps increase inflammation around the area to get the body to kick-start the healing process. Works for many... but not all patients.