Your doctor needs to take this more seriously. You have not really given much detail, are you going onto or coming off of medication?
It can be very distressing and frightening when our bodies suddenly betray us.
I had a really bad health scare earlier this year when I got very ill. I was exhausted and in constant pain and I thought I had everything from Cancer to insanity.
As it transpired blood tests confirmed that I was suffering an Auto Immune response to an other wise normally harmless virus. Basically because the virus was totally new to my particular immune system it kind of went into overkill and started attacking my bones and joints. Time and rest with some strong NSAIDS soon put my health right but what a relief to know that I was going to be ok.
Be more up front with your doctor and more determined to get to the bottom of things. Its your health so it's your responsibility to get your doctor more on board and you need peace of mind.
You may be suffering the bizarre effects of a virus, you may need an MRI scan, perhaps you are experiencing migraine(Trust me I get them. They can be that bad and do all those things and sometimes I'm afraid they go on for weeks) You may need your eyes testing or be suffering from some kind of stress related disorder.
Our bodies are weird and complicated, the smallest things can sometimes cause all kinds of terrifying symptoms. Try not to panic. Panicking wil only exacerbate your symptoms. Go back to your doctor explain fully what is happening to you and how frightening you find it. Insist gently but firmly on tests. Don't take no for an answer and don't let the doctor pull the old I'm an expert I know best routine. Because if he/she can't tell you what it is then they don't know best. Take control of your health. I hope you fell well soon. Stay positive. Get pro-active. Control.