Don't worry. We have your back.
No, I do not advise mailing your documents again.
Mailing again will only add to the confusion and possibly delay the processing of your return even more.
I know you are nervous, but the IRS is always busy this time of year and started the tax season behind because of the shutdown.
Follow this link for a tool to check, but don't worry if it takes more time for the return to appear in the IRS system:
https://turbotax.intuit.com/tax-tools/efile-status-lookup/
