Why do I constantly have to blow my nose?

Lemon tea is good, but in addition, go to the local 'salt room'. Salt therapy, or halotherapy is new in the USA, but it will help the sinuses like nothing else - it's compared to spending a few days by the seaside, but only better. Even serious chronic sinusitis, which doctors fail to treat, is a piece of cake for natural salt therapy. Google it to see if your city has it.