How can I create a passive income stream from an anonymous blog about healing from GAD?

It is sad to hear that you have General Anxiety Disorder (GAD).
As your first step, choose a pen name when you want to learn how to blog anonymously and make money. If your blog is successful, you may end up using the same pen name for years to come, so do not rush the process. As an example, if you are going to blog about business topics, choose an authoritative name. For instance, if your real name is more youthful such as Zoey or Milo, you may want to use a pen name with a more classic sounding first name such as Charles or Allison. If your blog is about comic books or pop culture, then select a trendy name. Type in your top choices of pen names online to confirm that other successful bloggers are not already using the name. One type is the Random Name Generator, a free online tool to use. You will need to file a fictitious business name statement. Once you have selected a name to blog anonymously, you can launch your site. Starting a blog can take only a couple of hours, but you most likely should spend time researching your market before creating a new blog. Niche blogs tend to do better than generalized ones. For instance, you can find countless blogs about popular topics such as selling on eBay or writing an eBook. When considering how to start an anonymous blog, you should not include your personal name in the URL. If you are planning to monetize your blog eventually, self-hosting is preferred. When you host your blog, you can run ads and advertise any products and services on the site. You need to pay a minimal monthly fee to get your website online.
Most bloggers work extremely hard to connect with audiences and earn extra money in the process. If you want to monetize your blog, you will have to work at it. For instance, you may decide on posting two blogs a week. If your blog is not active, you are less likely to build traffic. As your audience grows, you will be more likely to earn money from the blog.
You can read more here: https://financialwolves.com/blog-anonymously/
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath

When you register your domain, make domain registration private.

Then post under a pen (fake/made up) name.