This was posted yesterday, so I hope you're still with us.
If you have not done so yet, call the fire department. Propane is no joke. The fumes can kill you from asphyxiation, the fumes can ignite and cause a fire or if the air/fuel mixture is just right and you get one tiny spark even from static cling, you get a big boom that can be heard a mile away.
After the tank is confirmed empty or sealed, go to a dealer for a full inspection of tank, lines, fittings etc. Up here we have something called a Propane Safety. The dealer has a government issued list that is complete overkill that they check out, this is what you want done.