There is so much information on this board about kidney disease and dialysis that it would be a good idea to start reading. It is scary and there is so much to learn and manage but that is what all of us here are doing since this is our life. Also try to get your Dad to join us and take charge of what is about to happen to him from the sounds of things.
His creatinine is high because his kidneys are losing their ability to get rid of it. Serum creatinine is a good indication of kidney function since it is the byproduct of the normal breakdown of muscle in the body and therefore tends to not be a reflection of diet. A 24 hour urine test is a better indication of percentage of kidney function than is an eGFR which is basically an guesstimate. People start dialysis at different percentages, 10% being a rule of thumb. But everyone is different and I started the second time around at 16% since I felt wretched. Your Dad needs a nephrologist and he needs to keep hunting till he finds one who appears to have time for him.
Diet is extremely important in all stages of kidney disease. Pre-dialysis requires a low protein diet, salt is seriously to be avoided (contributes to the high blood pressure too)and he might consult with a dietician and also do a search here on pre-dialysis diet. Since that's where he's at right now that's the place to start. He will most likely need to watch potassium and phosphorus... there are lists of foods that are high and low. The diet is complicated and frustrating and difficult to stick to but not watching what we eat can cause more trouble in the long term so we do what we must.
Dialysis has huge effects on our lives, it changes them dramatically BUT it is important to take heart from those of us, and there are many, who work around dialysis and live well in spite of it. Your Dad needs to get information about all forms of dialysis, peritoneal and hemo and not be pushed into a modality that makes the most money for a doctor. Home hemo is a possibility, a very good one for those who can do it, and nocturnal dialysis is probably the best for cleaning the blood. Some people swear by peritoneal although others have terrible trouble with it. Each modality has pros and cons.
There's no point worrying about the people who die on dialysis...of course there are deaths on D, people die all the time for different reasons BUT what is certain is that those of us who reach the point of needing dialysis will definitely die if we don't get it so we must do the best we can to take charge and be prepared with as much information as we can.
Please ask any specific questions you might have...we have so much collected experience here it's incredible. I'm so sorry that your Dad and your family are facing this but I am glad you found IHD.