I hope he's joking... But if not, I totally understand how no sleep and 24/7 anxiety could lead to this level of catastrophization.
@Shadow I know new symptoms can be terrifying, especially when they're as debilitating as complete insomnia with accompanying physical pain. But I've been there too, and I can tell you that being in an all-day panic about it and scouring the internet for answers will only make things much worse. I know from personal experience. This is what has helped me hop off that hamster wheel of anxiety, which I've found myself stuck on many times in the past year:
Calming physical activity (e.g. yoga, walking, tai chi, etc.)
Getting out in nature and being mindful and appreciative of your environment
Interacting with friends/family NOT on the topic of illness
A warm bath (not too hot, because I'd bet your low on electrolytes and sweating won't help)
Breathing exercises
Meditation
When you're really worked up, the more physical calming methods will probably be of most help, like a long walk or yoga session. When my health anxiety is really high, there's no way I can meditate or enjoy a bath. That's why I would combine many of these, starting with the active options and following with breath work and then meditation.
I also know the feeling of being up against the clock, like if you don't find an answer to your problems TODAY your body will deteriorate to a point where recovery is out of reach. This feeling of urgency also only exacerbates your issues. The body is resilient, it can bounce back from a lot. Think of it this way - will giving your mind a break from health anxiety for one day really hurt? If you choose not to spend all day on the internet today searching for answers to your problems, choosing instead to treat your mind and body to some much-needed care and relaxation, will you really be worse-off tomorrow? Just give yourself a break for a day to see what happens, because there's nothing to lose.
If you combine these practices with some of the supplementation recommended earlier in the thread, making sure to get plenty of electrolytes, then I'm confident that you'll see some positive results.
P.S.
If someone wrote this to me, my first thought would be that they're being condescending and not taking me seriously - that they don't understand how real my symptoms are. I fully believe that you're symptoms are real and severe, because I've been in a similar spot based on your description. Your symptoms don't have to be "all in your head" in order for mind-calming techniques to have a significant impact on your symptoms.