Since 3-4 days I'm feeling restlessness, nausea, gassy, lightheaded & dizzy, sometimes facing difficulty in breathing, pain in arms, shoulders and Legs, strange feeling in the jaw and left chest region sometime,  I feel My blood pressure is rising and can feel the heart palpation and I feel a little sweaty sometimes, constant fatigue and tiredness is there. Not being able to enjoy things and activities that I earlier did & enjoyed. Not trying to skip my meals but don't want to eat much. My sleeping pattern is also disturbed because of this including other factors as well. Last night I was shivering and woke up suddenly. Also, facing difficulty in breathing few times. Dont feel like talking much, just want to lay down and do nothing. I can't understand what exactly is happening and I'm constantly tensed about the situation. Is there anything really serious or I have to be a little cautious about anything? Thank you so much in advance.