Relax......look at where you're going with your playing overall. Don't look at the day to day small failures you feel that you are having. Look at it this way: lets say you are taking a trip from Florida (Miami) to California (Los Angelos). You have a starting point and a destination ,in between those two points events happen which may cause problems (flat tires, run out of gas, engine blows up, the dog dies :), etc. You still take the trip though and you deal with those problems along the way. You deal with them by planning (Buy AAA, maybe get a better car, fly, leave the dog at home). With your playing you (I) plan by practicing scales in an organized way (daily), etudes, use a metronome (always). This is the planning part of being a musician; it won't make the frustration go away but I bet it will help. The difference between taking a trip and playing music is that in music you never really "arrive", Thats what makes it fun and maddening. Thats what drives everyone forward to do better. So, go back to where you are comfortable: scales, etudes, jazz, whatever and build out slowly from there.
Hope this helps. Yours was a tough topic, could feel the confusion in it. Maybe the others will be better able to respond.