Some people think that their health is a great mystery, a capricious part of life that can come and go quickly.
If you have an accident, maybe. Otherwise, no. Your health is a sum total of a whole lot of things you do and have done over your lifetime. A commonly repeated story is of someone who had no health issues, no complaints, no pains, and out of the blue decides to go for a physical, at which time they're told that they have inoperable cancer, and they're dead within two weeks.
No. A trajectory of illness almost never happens that way, and statistically, it will never happen to you.
Health (which is more than a mere avoidance of illness) is not very complicated. Most of what's needed to ensure good health are things you can do all by your lonesome self, without the need for medical professionals or interventions. They seem weirdly simple, and they are. But done over the course of days and months and years, they add up to keeping you strong, healthy, sane, and safe.
So what to do? Oddly enough, the most important thing you can do for your health is to not think about it a lot. If you are constantly fretting about getting sick, your body and soul have strange means of getting you in line with this thing you're thinking about all the time.
Stop thinking about your health, and stay healthy. You want to develop a positive mental outlook on life. If you wake up in the morning with a little sniffle or some other minor ailment, you're far better off to ignore it and go on and live your life that day.
Bottom line? Good attitude. Laugh a lot. Don't be so grim. Despite all of your efforts, 100 years from now, you won't be here. Rather than bemoaning that, look on it as a reminder that life is short but wonder-filled.
Next, food. I don't need to remind you to avoid sugar a much as you are able, but apart from that, there's a range of foods that can be eaten to make up a good diet. Best avoid something that you don't know where it came from. Lots of meat, lots of good fats, especially butter. Fresh fruits and vegetables. Fundamentally, stop eating junk. If you're overweight, do your best to lose the extra. And, of course stop smoking.
Fresh air, exercise, and sunshine. Contrary to what the cranks tell you, your body needs sunshine. Don't let yourself burn, of course, but you need sun exposure, without sunscreen, often. Daily is good if you can but at least every few days, spend an hour in the sun. Walk a lot. Don't sit so much. And get fresh air. If your climate permits it, having windows open at night is a good idea.
And get good, quality sleep. You need at least six hours of sleep a day, and more likely seven or eight. Getting less than six hours of sleep a night is correlated to dementia and other cognitive problems.
There you have it. Nice, easy, and succinct. Notice that I said nothing about taking aspirin or getting a medical test, or anything complicated. If you have a health issue that won't go away, consult with a doc about it, but otherwise stay away. Leave medical professionals alone as much as you can so they can deal with people who are truly sick. And when you have to deal with medical professionals, try to find one who will let your body take care of itself.
Above all, don't worry about your health. Give yourself good inputs and your body will usually take care of itself. You can count on that.