On Saturday a week and a half ago, in desperation, I left my stim on a setting I hadn't tried for long before. It is the 10th setting which is a burst one, so I can't feel it and I turned it down 20-30%, as recommended. At the time I didn't feel anything helpful but I decided to leave it on just to see.
It wasn't until the Tuesday that I noticed some relief. To start with I could do things that would normally have meant added pain, but it didn't. I also noticed that my scalp was really tender and overly sensitive.