I hope you're at a clinic already, but if not and you read this, get to one now.
You can try a CVS MinuteClinic if you really want to, but only if you can find one that will see you immediately. This can not wait until tomorrow.

> am not sure the most financially responsible thing to do

The most financially responsible thing to do is to get this seen and treated immediately, before it turns into something that requires hospitalization. It can only get worse and more costly from here.