No, you are not the only one who thinks this way, it's tempting. Like thinking the drinking or drug will make you feel better right now, never mind the problem is still there the next morning.
You have to trust that in five weeks, following the eating plan/calories outlined in the other thread, following a serious weight training regimen and reasonable cardio, you can make very quick changes in your body.
If you starve yourself to "jump start" your weight loss, you will lose the weight in muscle, first. This has the long term consequence of further reducing your metabolism. You hit that "magic number" and you are no longer fasting or starving, you now have a further reduced metabolism. Additionally, if you are in starvation mode your body will do everything it can to hoarde fat. You also risk damage to your endocrine system, most specifically, your thyroid which is the master regulator of metabolism. Trash your thyroid and if you think losing weight is hard now look out.
Finally, (and I hate to harp on this), but you (and me in one week) are 45. We are not in our teens or 20s any more. Our bodies do not bounce back from the kind of abuse we used to be able to subject them to without risking repercussions. Going on something like a protein fast is potentially damaging to your thyroid, intestinal tract (need I mention constipation?), and even kidneys.
Simply put, you do more long term damage by trying to starve yourself for the short term. It's like taking one step forward and two steps back. How many times have you done it before? Juice fast, regimented dieting ... and it lasts five or seven days then pffft. For nothing. Worse than nothing, you've made the situation worse because you've lost more muscle.
Long story short, "The definition of stupidity is doing the same thing over and over again and expecting different results." — Albert Einstein.