When I use drain cleaner the whole house smells like sulfur for a couple hours
I would advise against Drano. The sulfur smell you are smelling is because it is mainly composed of Sulfuric Acid. If you smell it throughout your house it might be damaging your pipes. 

To clear a clog I would recommend a plunger and a drain snake before resorting to any acids. If those do not work I would recommend a plumber.

However, be cautious now. If you are manually clearing your pipes, anything that you pull out might be covered in acid, so make sure to use hand, eye, and nose/mouth protection.