I had really bad headaches could it be my sinuses?

It could be.: However, headaches can be harbingers of more serious conditions, such as hypertension, intracranial bleeding, tumors, etc, if they are new onset and remarkable in character compared to past headaches. Your eyesight may be giving you headaches. However, sinus headaches are characterized by fullness and tenderness to touch over the sinuses, yellow drainage, and occasionally fever. See your doc.

Possible: There are 3 sets of sinuses. Infection or inflammation, or pathology associated with any of them could cause headaches.