Like you said, it's probably useless to go to your doctor, but it may not be useless to go to A doctor. I've had doctors like that too. They treat you for a few months with drugs that don't work and then tell you it's in your head. Well, that's when you change doctors and find one that will actually care to find a diagnosis rather than simply act as a drug pusher and give up if any real work is involved in trying to help you.

In addition to that, you might be interested in looking into alternative medicine. Perhaps you could find a Naturopathic doctor in your area. Sometimes you can find Naturopaths that are also MD's as well. The advantage of alternative medicines is that they aim to treat the problem at the source. Rather than giving you anti-inflammatory drugs for a headache, they attempt to find what's causing your headache and aim at solving that. The whole body is connected and sometimes the whole body needs to be treated. A problem in the knee can cause problems in the chest. A heart problem can cause headaches. Etc, etc. Alternative medicine is more difficult though as if it is properly administered it requires life changes like exercising, diet, changing your environment (air purifier, water purifier, getting rid of household chemicals), etc. Sometimes it's simple enough that some supplements can help. High quality vitamins are always a recommendation (I find USANA to be the best). Other times remedial supplements might help, especially if it's a temporary problem like an infection out of control and chronic. However, other changes also help fight the infection in addition to just taking a supplement that kills infections.

I'd think it'd be best to find a new doctor and continue to find an answer. Blood tests, heart tests, perhaps an Ear Specialist (since you're dizzy) and so on as your doctor recommends. However, I'd hope you'd also consider seeking a Naturopath's help. If nothing, he can help you onto a healthier path. You might find natural medicine (When I say natural I do not simply mean herbs and vitamins to replace drugs. I mean a method of treating the body at the source of the problem. Changing that which is imbalancing your body's natural ability to heal. And using natural techniques such as diet, exercise, etc. Avoiding drugs that aim at the symptoms rather than the disease. And drugs that aim at the disease rather than the source.) to be amazing and amazingly complicated. I've been into it for several years now and I'm constantly learning new things. Just like the conventional drug market it is a profit market. So of course there are products that make big claims with small delivery. That's why it's complicated, because you'll have to work around the marketing claims, and you'll also have to realize it's not as easy as taking a miracle pill. The best way is to change your habits to bring about total health. A Naturopath could help you, because there's simply too much to learn. He'd also be able to better recommend where to look for your specific conditions and what to do.

Sorry that I couldn't be of any direct help to your specific condition. It's just that I've found conventional medicine not very adept at curing diseases, only treating symptoms. I've also found them inept at treating symptoms when all their tests show nothing is wrong. Over the years I've had several problems that the doctors and conventional medicine have offered me no help with, but through alternative methods I was able to again live.

Hope you find a diagnosis with a new doctor, and of course help and relief.