Games usually go straight to H.

One of two things has gone wrong. Either your thought process or your visualization is failing you. Since you were able to see the move was a mistake right after you played it, you're not missing some special knowledge about tactics.

Try slowing down your thought process a bit. Make sure you double check for danger -- examine all captures and checks especially.

Try practicing visualizing the board. Imagine what the board will look like after a piece is moved. Calculate all the responses that can be made -- what new threats are there, what is no longer defended, what new lines are opened for pieces.

 My thought processes have been screwed up for a long time. I learned this game becauses I heard it helps your concentration. I'm not sure if it will, however.

I had about four games in progress a few months ago, blundering a minor piece in two of them with a 3 day per move time control. I didn't think this was even humanly possible, even for a beginning chess player! A break from turn based chess became clear, as my ability to concentrate had failed.

In blitz, I blunder pieces often. As my tactical strength continues to increase, this will happen less often.

I analyzed your game with a microsope and concluded that your understanding of development is far above your current rating. Once you resolve these difficulties with concentration, your online rating will jump dramatically.