massive tilt


The answer to your question is you did not necessarily became worse. There are several factors that contribute to losing games. It just means that there are things we can improve on.

You do not become worse just like that. Unless you physically damage your brain, your chess skills are not going to evaporate in a matter of days/weeks.
Tilt is your emotions hijacking your rational decision making. If that happens, you are well advised to stop playing until you regain your composure.