Been feeling lightheaded for 2 months. Often get headaches and feel like I'm losing my balance when I stand/sit still. I'm always tired. Any advice?

Get seen ASAP. You have been sick too long. Time to see a doc. Dizziness, headaches, and fatigue can have many causes: some minor, some major. If you are taking any new over-the-counter meds or supplements, stop for now except for acetaminophen or ibuprofen (with food only and not if nausea, diarrhea). Do not drive or operate hazardous machinery and avoid heights if you are frequently dizzy. Get seen this week.