What Causes Dizziness And Nausea?

The last two days I ve felt consistently dizzy and light headed with some mild nausea/queasiness. I don t have a sinus infection, head cold, or severe congestion in hear or ears. I do have environmental allergy/sinus issues, which have been noticeable the last few days. I very recently had full blood work done with no issues. I haven t added or changed medications or made any lifestyle or dietary changes. I m on a very low dosage of Efexxor, which I ve been on for a few months with no issues. I m 55 and not having any major hormonal problems, except occasional hot flashes. Could severe mold allergies be one of the reasons? That is my worst allergy problem. And I do get barometric migraines, which hasn t happened recently. Thank you.