OK--please let me know if you need me to continue after this which I'll be glad to do
You definitely need the cardiac workup with an ECG, echocardiogram, and a Holter monitor to see if this is a cardiac arrhytmia problem
For the tinnitus and balance problems I would get an MRI of your brain and ears to look for problems in your cerebellum and your inner ears and acoustic nerves.
You also need a thryoid panel to look for either low or high thyroid function problems.
Also--some of this could be a menopause situation, so I would check your estrogen, progesterone, testosterone, FSH and LH levels.
Finally, while a reasonable amount of this could be from an anxiety problem, I don't think we should say that is the only problem
Please let me know if I need to follow this up with more information for you.