My own stress and concerns aside, you probably should check out
https://www.healthcare.gov/ if you're currently uninsured. You may discover you qualify for cheap or free health insurance if you're sitting just above the poverty line, and a significant discount if you're comfortably above the poverty line (under $35,000 estimated income), it's worth at least filling out an application to see.
If you already have or had a doctor and you want to keep them, be sure to ask them which insurance plans and networks they accept. While geographically close, my doctor is outside my county, so this was a concern for me. For a particular insurer, she accepted all networks except E. Most of the plans on the marketplace were E, but not all of them, so I did manage to find a plan that let me keep my doctor.
The deadline is March 31, and I don't recommend waiting until the very last day. Best to get it done now.