Watch the Ain't Sad for Long online guitar lesson by Corey Congilio from Slow Blues Guru
Not all slow blues songs are sad or depressing! Here's an example of a chord progression that goes from minor to major. I really like how this solo navigates the changes and plays literally the same fingering for the licks and double stops as they're going by.
This solo, like many of the others, isn't too fast. Just because the tempo is slow, doesn't mean you have to play your fast licks. I know it's tempting, but practice some discretion and try to be melodic when telling your story. Give the listener something to remember!