I know the frustration you are going thru and while your symptoms are representative of those of someone with GAD (general anxiety disorder) and panic attack, I would take another MRI and I would check the neck region just to make sure everything is okay and maybe at the same time dismiss your anxiety. I bet they already checked your for any abnormal neurological symptoms such as pupils reaction to light etc. which in case they were abnormal would indicate a probable brain tumor or neurological disorder. Your abnormal EKG could explain some symptoms tho.
My personal opinion is that anxiety is really a problem for you and being uncertain about your health is not helping you so better make sure exverything is ok then maybe see your anxiety go away.
Tests I suggest? MRI of the spine (neck region) or Ct-Scan (inexpansive but radiations compared to the safer expansive MRI).
Neck X-Ray is something quick that can be done too before you decide if you want that neck spine MRI.
Unfortunately, your story is all too common; you are told it is stress, anxiety, blah, blah, blah and while you are suffering, miserable and sent home with a pocket full of Rxs for antidepressants, anti-anxiety medications, etc. Yeah, who would not be depressed, stressed and anxious if you don't have answers for what the hell is wrong with you. I think that is why Medhelp is so popular. Most of the people are in the same situation you are in.
Secondly, I would get another MRI of the brain/head WITH CONTRAST and ANOTHER NEUROLOGIST. See if you can obtain a copy of your last MRI report you had done and read it for yourself. Makes you wonder what that "small spot in the back of your head" is/was.
Lastly, hang in there. I think there are more and more physicians that want "quick and easy" to figure out nowadays. It takes too much time and effort to deal with the cases that require that extra investigation, so they label you with something just so they can do their dictation and move on to the next patient. However, I still believe there are some physicians that truly care about their patients and want to deliver the best care they can give.
Keep us posted.
I am little surprised you haven't been referred to an ENT specialist(Otolaryngologist) for your vertigo, dizziness etc., symptoms. They definitely do a bunch of tests which ofcourse may or may not prove something wrong. It is not like MRI, it is more like balance tests, ECOG etc., If you get dizzy if you tilt your head on one side then it may be BPPV which may be fixed with some therapies. Unfortunately if you don't have insurance ALL this can be expensive.
I have head pressure, dizziness, visual disturbance after a head injury.
Was prescribed bunch of anti-depressants and nothing worked. Found Xanax a little helpful for my dizziness, head pressure, nausea etc., Again not to the point of functioning. They called me as a complex case.
As other members mentioned a spot in the brain is not something to be ignored if it is not from a head injury. Get a good neurologist and other specialists who can listen. If they can't find the root problem they say it depression, anxiety, migraine.
Just wondering if your issues were ever fully resolved. I am suffering these symptoms as well