For Over A Year Now I Have Been Extremely Dizzy,

For over a year now I have been extremely dizzy, lightheaded, nauseous. Over time it has progressed. I started getting panic attacks for no reason. I have seen serval doctors.We have ruled out anything psychological, hypoglycemia, no heart problems,pretty sure it's not anima, & it's not vertigo (although I will say I have experience vertigo) (today is Friday) I also want to add that on Wednesday I passed out. I went to the bathroom at school because I thought I was gunna throw up, which I didn't. When I looked in the mirror I realized my vision was delayed, my face felt warm & was red. My eyes were glossy &looked like glass. I made my way back to class & as I was a few steps away before I passed out. There's was a split second where I felts something was really wrong then I lost control of everything & woke up on the floor. I landed on my head, but luckily don't have a concussion. I wasn't able to come back to school till today (Friday)
I passed out again 3 times today. I feel very disconnected from my body. I feel very week. I don't know if this has anything to do with this but my body is refusing to lose weight no matter what I do. I've got multiple blood work done. I'm exhausted from all of this I have am appointment for an ent Tuesday but I am still scared I won't get any awnsers. I'm not allowed back to school until I'm seen by a doctor. Does anyone know what's wrong with me