What Causes Sudden Dizziness Along With Fatigue And Confusion?

Hello, I am trying to find out what type of attacks I used to get as a teen and now have occasional precursor or mini attacks as an adult. It feels as though it is biological or hormonal in origin. However, when I was a teen I was diagnosed by our family MD as panic attacks and prescribed Imipramine. The medication may have reduced occurrences but did not stop them. I had several attacks in one day which resulted in such fatigue that I needed to be assisted to walk. The attacks stopped independently after a few years in young adulthood. Since then I will get little precursors much like used to indicate an imminent attack before a major attack as a teen. I have read everything I can about panic attacks and while a few minor points sound similar, I do not believe that is what they are. They were like dreaming while fully awake and functional and I was able to communicate and listen during them although only did so at the encouragement of the doctor. I learned to dread the attacks because of how exhausted and yukky I felt afterward and believe the doctor used this information to diagnose panic disorder. Having mini attacks this morning and am left feeling dizzy and slightly confused and brain fuzzy in general. I am currently on Synthroid of 4 mg I think? And Zoloft 75 MG per day and a blood pressure med in the AM however I was not on any medication as a teen while experiencing the full attacks. Any ideas is greatly appreciated! Dana