I started to play chess really badly

Hi, I have started to play chess really horribly... I sleep, go to work, play chess and really bad performances is able to see... Weak ago I played on Lichess and I was really good in tournament up to 1500elo I ended 6th with performance 1750 elo but suddenly after work I went home, sit in bus, played a few chess matches but it was terrible all loses, performance to not be proud of. When I came home I said to myself "Ok maybe I'm tired let's sleep" but it become much worse from 0 up to 1 blunder per game I started doing 7 blunders and in that moment I didn't know what's happening so I said to myself let's on Chess.com play against weaker opponents maybe I will rise again... I started play but I fall from 1000 to 740... Frustration started to come, I'm tired of this, stress, etc... You know I'm playing Chess in team so I go on tournaments etc... From draw against 1700 ( official elo! ) I drop down to losing against 700 on Chess.com... 

I don't know what to do... The only thing I'm good at (Thinking - High IQ) is tearing apart... any advice?

Stop worrying about a game. Do you have cancer? Has a loved one been diagnosed with dementia? Did you lose your job? Those things are things to worry about. As far as chess is concerned, pick a great player of the past and study his or her life. Play through their games. This will refresh your enthusiasm for chess.

so basically you're saying that I should read a book and calm down for a bit... hmm maybe you're right... I was planning to read book about opening variations... If you have a book to recommend around chess you can share it with me I would like to know what chess players are reading