Call your doctor/prescriber to see if you might need emergency birth control
Because fatty acids are also known as lipids and lipids are used for long term energy, and proteins are also used for energy. I think that this makes them essential because they are able to keep a healthy amount of energy in their system and without them they would not be able to do so.
The superior vena cava is the large vein which returns blood to the heart from the head, neck and both upper limbs. The inferior vena cava returns blood to the heart from the lower part of the body. The return of blood via the vena cava can be compromised and cause disease. (Take that info and see if it helps)