Advice on walls

My wife and I just bought our house and decided to rip out a L shaped wall that seperates the kitchen from dining room. Its a single story trussed roof so I was hoping it wasnt load bearing. I pulled some sheet rock at the top and found 2 2x4s, and thought all was good. But when i got to the doorway i found a 4x12 header. Its nailed into one 2x4 and floating above the other. This wall runs parallel with the ridgeline and perpendicular to the joists. Other end of the L shape has 3 2x4s, and this wall is parallel with the joists. And where they meet, somone put in a janky bar top and cut out a chunk for a light switch leaving the wall loose. Ill attatch pictures. Id really appreciate any advice and insight into if these are load bearing, or if its just a big header for a doorway.

 

This is the 2x4s that were cut in order to put in a light switch. The wall that had the bar top is completely free floating from the other wall.This is the 4x12 header in the doorway. It looks like it's resting on 1 2x4 but it is not. It is nailed into the 2x4 next to it. The header ends at the studs on the opposite end of the doorway. This wall is perpendicular to the joists. This is the 3 2x4s, This wall is parallel with the joists. This last one is just a brace I found in the wall.

 

Between the header and the double top plate it has the indications of being a load bearing wall. What is directly above that wall? If attic, is it site built or have trusses?

 

Its trusses. No lapping joists anywhere. Which is why i was suprised by the size of the headers. They dont appear to have tension on them though.

 

Unless the truss end [supported by] on that wall, it isn't likely it's load bearing. Might be time to get a qualified person to come out and look at it. better safe than sorry