Rct on #10 by endo 2months ago. pressure in upper jaw into sinus, headache, nausea. doc says wait for jawbone to rebuild but apico possible. wait months with these symptoms or get apico surgery?

Accurate diagnosis: Unless you have a very long root w a very large lesion at the apex, I am skeptical this is causing your problems. I would recommend a second opinion by an endodontist. Also, is the tooth sensitive when biting? And do you have swelling and/ or palpation tenderness at the apex? If yes to these, then an apico or retreat is in order!

F/U with Endo: If your symptoms did not improve at all after 2 months, i would recommend going back to your endodontist. It is likely that the tooth needs apico or exploratory surgery.

Differential Dx: Personally, i doubt the headache, nausea and even the sinus pain is related to an unresolved infection on #10, especially if the rct was done by an endodontist and two months ago. I recommend you do two things. First, have the endodontist re-evaluate your tooth. Seek a second opinion if necessary. Second, see your primary care physician for a medical evaluation.