What Should I Do About Sudden Shortness Of Breath For Two Days With Heaviness In My Chest?

From last 2 days suddenly I m feeling shortage of breat What should I do because I have consulted to best doctors but no good result and all doctors suggest the heavy dose due to that I m suffering a lot what should I do kindly suggest because I am not able to take small breathing as well and I m feeling to heavy on my upper breast areas