play the first bit Bm & A as a minor blues scale at the 7th fret.play the next bit(if you want to stay in a box at the7th fret)
as mode as follows b,c,d(on bottom e string) e,fsharp,g(a string), a,b,,c(d string) d,e ,fsharp......f sharp,g,a
b,c,d(top e).i think it's phrygian mode, i forget the names but remember the positions.
this is in fact a g major scale but starting from the b.all the notes of the c g d section are contained in this scale,
but hitting the notes of the chord as the chord is played reinforces your progression.this is just a starting point, and how i would go about it.
hope it's not confusing!