Is there any way to get health insurance the same day I apply?

I had health insurance with my previous employer that I had to leave. I left the job on August 26th, and there is no grace period for the insurance. The insurance was deactivated on my last day.

My new job can’t give me full time hours (required for health insurance) until October. I was debating just staying at my previous job until October, but the new job would’ve had to give the position to other applicants, so I had to take it. So I am without insurance until September and it’s just making me very nervous because I do have multiple chronic health conditions and God forbid I have to go to the hospital for anything, that bill out of pocket would ruin my life.

I just need some sort of insurance to get me by until October. Is there any plan that lets you get insurance the same day or week of applying?