What Causes Shortnes Of Breath While Suffering From High Cholesterol?

I m 65 year old female with heart disease (high cholesterol) having been treated for 15 years of more now with statins. I m off not for 2 months, Praluent didn t reveal any great advances for me either. Recently, I have experienced some shortness of breath, but am confused if it is related to a pretty bad case of head and chest congestion or related to my heart disease....or something else entirely What is noticeable are a slight nausea (not eenough to make me vomit) just a heaviness sort of drop feeling but also even more noticeable is any pressure that is in my mid area from upper stomach to lower. as in holding my grandbaby, i m feeling the need to move him around so I can breathe better OR take deeper breaths. Also noticing when I sing, I run out of breath before I can finish a stanza . Any and all theories are appreciated :) thank you