KGS, you again?! 
Gut shots are very painful, often have very long recovery times, because of the massive infections they are prone to. When what belongs inside the gut, wanders into better neighborhoods, everything can and often does, hitch a ride in the proverbial hand basket.
The gut shot itself can cause major bleeding, without involving other organs. The mesentery is the covering that holds the intestine together. It is extrordinarily vascular. A shot ripping through the mesentery and the bowel is a bloody, stinky, life threatening emergency. The Mesenteric arteries come directly off the Aorta.
BTW, a severed artery in the abdomen would be, if not fatal, life changing. Better the artey is damaged, and repairable.
As far as the waking up thing, often, with big abdominal trauma, the patient would remain intubated after surgery. Likely, he would be given a paralytic agent to prevent movement, which could cause more injury. Paralytic agents are not sedative, nor do they relieve pain. If a sloppy anesthesiologist were to neglect to order sufficient analgesia and sedation, your patient would experience massive pain and be unable to tell anyone. He it’s very doubtful his heart would stop, although, pain can cause multiple symptoms. It actually will increase heart rate to an alarming level. It can cause blood pressure spikes or it may cause the blood pressure to drop to such a profound level as to required the support of vasopressors.
Any untoward symptoms would be “discovered” by a nurse, never a doctor. The nurse does an assessment at least once an hour. In very critical patients it could be as often as every 5-10 minutes.
The surgeon visits once, maybe twice a day. He does an abreviated assessment, because he relies on the nurse to be alert to any changes. In most ICUs if a patient has a terminal event, the nurses start the rescusitation. The doctor runs the show once he’s on scene, but, prompt action by the nursing staff save the life.
The ICU nursing staff would never allow a chemically paralyzed patient to go unmedicated. I have, however, recieved patients from anesthesia that have only paralytic recorded on the flow chart. ( In the hospitals where I’ve seen that happen the anesthesiologist has been immediately suspended, one was fired, one was not.)
The only action that would be taken would be to immediately give a dose of narcotic and sedation intravenously. They act nearly instantly.
Two weeks is a very optimistic recovery time. They invariably have stubborn peritonitis, so the surgeon often wouldn’t even close the wound for 3or 4 weeks. When it finally is closed, they need to be watched it be sure the infection is truly clear.
As far are the extent of recovery, if the person was young and in good health prior to being wounded, they should make a full recovery. But realisticly it would take 3 weeks to many months.
Once the skin of the abdomen is healed, normal exercise shouldn’t cause a problem.
Being shot or stabbed in the liver or spleen would be serious, but a surgical repair would bring him back to 100% fairly fast. He wouldn’t be intubated, paralyzed, or even in the ICU after surgery.
A damaged spleen would be, as outlierrn said, removed. It’s not ideal, but life without a spleen is livable.
Livers, on the other hand, have to be repaired. Life just ain’t worth livin’ without it. Or even possible. The liver will regenerate to some degree. Controlling bleeding is often the biggest problem. A severe liver lac can require upwards of 40 units of blood during surgery. Once repaired, the person may or may not be in the ICU. Just the fact of receiving that much banked blood might buy a ticket. The person would likely not be intubated, or paralyzed. They also have a hightened possibility of breaking loose a clot that can cause stroke, heart attack, or other eschemic injury.
(or worse)
