Watch the Help Me Blues online guitar lesson by Jeff McErlain from 50 Eclectic Blues Licks You MUST Know
This is one of my favorite blues feels, it's a cool minor blues similar to Green Onions.
The little descending lick I use on the IV chord is quite common and can be heard in many tunes from My Funny Valentine to Michelle to Stairway to Heaven. It really makes the IV minor chord much more interesting and can be used just about anywhere when you are sitting on a minor chord for any amount of time.
Also take note of the right hand motion I discuss in the video, this SRV style rhythm technique is key to getting this shuffle feel together.