The symptoms could be due to many causes like low blood pressure, low blood sugar, heart causes, electrolyte imbalance, liver and kidney
dysfunction, stress, panic disorder, or even due to hormonal imbalance of menopause.
You need to immediately consult a doctor who can examine you and run tests to rule out these causes one by one. You could also be having a mini-stroke. If you cannot otherwise get a doctor, I suggest you rush to an ER.
Eat something and drink fluids and see if it helps.