Dear Tammy, Thanks for providing quick additional information.
I'm so sorry to hear of your discomfort.
Tightness in middle of chest along with fatigue
and dizziness can occur with from Angina pain.
Angina usually starts with chest pain or tightness.
It is a chest discomfort which occurs when there is decreased blood oxygen supply to an area of the heart muscle.
This pain can be felt as dull, heavy, tight or severe. Also pain and discomfort may spread to your jaw, neck, arms, back or stomach.
You need to undergo few tests-
-Blood tests, such as a blood count, glucose and cholesterol level and specific blood tests for heart damage.
-EKG should be done.
Stress with anxiety/ pain attack may also sometimes cause similar symptoms. To be Honest, I may not be able to pin-point exact cause online, without clinical examination and tests.
Further evaluation can be done after clinical examination and tests.
I suggest that you should not delay and rush to ER ASAP.
You should get immediate medical care.
Please let me know how I can be of further assistance.
My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back, I am happy to address follow-up questions.