The fuck are you talking about holding your breath isn't going to lower your blood pressure
that still doesn't explain your lower back pump from eating and face bloating from Kidney failure.
FYI below..
Does holding your breath lower blood pressure?
Through breath control you can voluntarily relax your involuntary nervous system, which regulates the heart, digestion and other bodily functions. Dr. Weil says breath control can lower blood pressure, correct heart arrhythmia and improve digestive problems.
Have a banana an hour or two before being tested. Bananas contain potassium, an electrolyte that plays an important role in some of the mechanisms that control blood flow and heartbeat.
If possible, take a walk for 15 minutes before your exam. This will create rhythmic breathing and oxygenation in blood, reduces anxiety and can lower your blood pressure.
Deeper breathing 15 minutes before being testing can have a significant but temporary effect by reducing anxiety and increasing oxygen, and lower your blood pressure. Also during your exam, close your eyes, take three deep breaths. Inhale slowly and deeply through your nose, and exhale out through your mouth 3 times directly before or while being tested. You may actually lower your BP 10 to 20 points by doing this.