Sinus Lift Complication?

[Mistydawn]

Hello, I had a lateral sinus lift, both sides six months ago. I blew my nose on the fifth month and four bone particles and slight bleeding occurred. Now, after six months had passed, I slightly blew my nose , because of post nasal drip, and I, have been having pain in sinus. I think the oral surgeon tore the membrane because from day one it felt sore and scabbed. What do you think could be wrong? I have to be able to blow my nose without pain, especially if I would get the flu. Thanks