You had a job loss that reduced your income substantially. If I recall, a number of people here were able to document a decline in income due to retirement and get the subsidy. Please call someone with the exchange or a more knowledgeable broker to verify that this does not change the qualification process. I'm pretty sure it does.
Right now, with zero income, you qualify for Medicaid. You need to get this figured out by the end of the month, so I would start with the DC Health people or a SHIP counselor if they have them in DC tomorrow.