RN told me to use Vicks sinex spray for 3weeks to help drain ear tubes after being on psedophedrine didn"t work, is it okay to use for that long?

Not good idea. Nasal decongestant sprays should only be used for about 3 days. Otherwise, a severe rebound congestion problem will occur and that creates a dependancy on the medication just to maintain normalcy. Sometimes topical nasal and or oral steroids are needed to break the congestion cycle. Best to see an ENT doctor for help. The eustachian tube problem will be alleviated with the same types of Rx.