I have been having problems with my heart. I am 38 year old female and my cholestral level is 175 which is normal but hdl level is 41which is low. I have heart palpitations and my heart beats really fast at times I can feel it in my throat. there has been a few times when my heart will race after bending down working in the yard or simply mopping the floor. I feel sick to my stomach a tightness in my chest and dizzy it passes within a couple of minutes. I have done the 24 hour haulter test and im still awaiting the results.
Magnesium is very important to heart health. Lots of people are deficient in magnesium. Grape juice is good for the hdl, particularly the purple. The white is good too, but the purple is better.  However, note that a study suggests that too much purple grape juice interferes with iron assimulation. Results are not conclusive but alternating purple with white grape juice might be prudent if grape juice becomes a regular part of the diet.
numerous things can cause your symptom.  The best bet is to see a doctor. If you are really in tune with your body you should be able to more or less figure out what causes your nausea.  Are you overeating?  How does your stomach feel before and after?  Have you changed your diet?  Certain spices may cause it.  Does it come and go?  Maybe your sphincter muscle in your stomach is weak.  There are lots of causes for nausea so I suggest for you to see a doctor if you can't figure it out on your own.