That's the unfortunate reality of the corporate overlord structure we've been living in for a while. If you're financially strapped and must go in, inform your coworkers ahead of time so they can arrange their working space to be away from you (and also let them know their company policy is compelling you to come in). Double mask and eat your lunch away and outside the office if possible. Bring your own sanitizers.

I've had coworkers in this same situation and I don't begrudge them for coming in under similar circumstances so long as they took personal precautions to minimize potential spread.

Hope you feel better soon.