<s>[INST] I have been feeling lightheaded very easily lately. Also, I have been seeing black spots and not only when Im dizzy, just anytime throughout the day. I am a 26 year old female and pretty healthy. Havent changed any eating habits or anything lately and not affected by working out. Also, I am so tired all the time. I could take 3 naps a day! [/INST] There are many causes for the probable symptoms you are developing1. Possible Tia- this is like a mini stroke. Now you might say that this usually happens in elderly. But sometimes it may happen in young too. The best way to rule this out is MRI brain DW2. Anemia- a simple lowering of hemoglobin may cause similar symptoms. A simple blood test can confirm this.3. Low amount of fluid intake may also be a significant cause as also the electrolyte disturbance can cause symptoms.4. arrhythmia-abnormal rhythm of the heart can cause similar symptoms. An ECG, and if necessary, a holder monitoring may be used.5. anxiety-this can cause all the symptoms. But I would like to consider it only if you have no other possible condition best of luck Chat Doctor.  </s>