Don’t overthink! I experienced same stress before during pandemic since my job becomes temporarily close while I have a lot of fixed bills on monthly basis that need to be paid especially insurance.
I focus on my current resources and try sellings goods on social media which helps me a lot to get extra income. I live near the manufacturing area of goods which I resell it on lower price compared to retail. I will not overcome this stress if I will just overthink about the problem and stop finding solutions. Check what resources you have and capitalize on that to get extra profit that will cover your expenses.
I did the same thing as you selling online when my job or my office was closed. I had bills to pay every month even though I had no income at that time. The more I thought, the more stressed I became, so sometimes I didn't think too much about things. This is because we have to accept that when we are not well, I did what I could do, such as buying and selling online and in the end everything was fine until my financial condition improved over time.
Therefore, I suggest you have a side job, like me. I work in a coffee shop, that is my main job, and I have a side job where before or after coming home from the coffee shop or my main job, I take myself to learn the features or aspects involved with photo editing, video taking, and photography. , because it is my side job. At first I studied multimedia majoring. Therefore, I occasionally use my skills on things related to photographers.
Having a side job can be done, as long as we are the ones who can balance our time, think about how to ensure that two jobs don't clash until finally I find the right time. So I suggest you have a side job to be your own leg so you don't fall when your other leg breaks.
with what you are doing is selling online, just try to deepen it, maybe it can develop, so well that you can have your own shop or warehouse. As long as you have good discipline and self-confidence and so on, I'm sure all these things can develop, don't be afraid to fail because failure is a lesson for us.