Okay, stick with me here. Going out on a stress-type reason voluntarily is a maybe for unemployment. Being terminated due to an inability to carry out your tasks to the level of the company's needs WILL be a valid reason for approving an unemployment claim. The downside is the termination process is a blow to your pride. But frankly, you haven't even worked there long enough to put this place on your resume. You will continue to earn your salary during the remaining time (however long that is) at this company.

Don't talk about unemployment or being "unable" to perform your job to anyone else in the company from now on and let the chips fall where they may. Starting today, you do need to apply to multiple places so you can also have the option to exit with a normal notice in case you are hired for a new position.

Above all, do NOT agree to go through 3 and 4 rounds of interviews with presentations and teams of people involved in the interview process. You will no longer be interviewing for that type of high level job. If the process does not involve more than 2 interviews, go for it. More than that, refuse. And try to apply in larger companies this time.