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.
While sometimes I have stress I try to give myself some good quotas which works even things are still unpredictable and life is not easy, but it's going on, and we are fighting hard for the better future.