Thanks for your question on Healthcare Magic.
I can understand your concern.
You are having irregular readings of blood pressure. Sometimes it is very high, sometimes it is low.
You are also having chest pain and
tachycardia.
So better to first rule out heart diseases in your case.
So
consult doctor and get done blood pressure monitoring, ecg, 2d echo and
stress test (trade mill test).
If all these are normal then no need to worry for heart diseases.
Sometimes, uncontrolled stress and anxiety can also cause fluctuations in blood pressure, chest pain and tachycardia.
So
consult psychiatrist and get done
counselling sessions. Try to identify stressor in your life and start working on it's solution. You may need anxiolytic drugs too.
Don't worry, you will be alright with all these.
Avoid stress and tension, be relax and calm.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.