Could you post the game where you felt this way. It might be easier to give you advice using a game that you played as an illustration.
Speaking in generalities, the position on the board plays a huge part on assessing what is happening and determining the best plan to proceed. When the position undergoes a major change to the point where you have to throw out your current plan, you simply have to reassess the position, determine a new plan, and attempt to execute it.
How do you come up with a solid plan when the board is so dynamic? I recently played a game where I looked a few steps ahead and formed a solid plan in my opinion, but then the opponent made an unexpected move that completely shattered it. Then I made a new plan, and again it was obliterated because of a move I did not really expect him to make, because it didn't really benefit him in the short term, only in the long term because of my plan. I lost that game in frustration because I came up with multiple plans and none worked. The game is so dynamic and unpredictable that I cannot see through it. Any thoughts?