ErHaO, I had the exact same symptoms, only a lot less 'extreme', so to speak. I don't ever really get ill from a regular cold, so I didn't really have any problems at all. My girlfriend's immune system is not as good and she was more ill. She also had the shortness of breath and loss of taste and smell; symptoms that are supposedly typical of this virus. Without being tested, she's pretty sure she's had the coronavirus, which would basically mean that I've had it as well. I was feeling more tired than usual and had had a cold, nothing too serious, then after a few days of feeling better I suddenly got this extreme headache. There's no way to know for sure, though it would be quite good to know if I've had it and that it didn't affect me a lot.
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Regarding the situation in the Netherlands; I get the feeling our healthcare system is very different from that of other European countries (mainly countries like Italy & Spain), where the goal is to heal basically everybody as soon as possible. Our healthcare system, or maybe our society, is more focused on quality of living, rather than stretching out a life when there's barely any chance for recovery. We're also not prone to place everybody who enters a hospital on the Intensive Care immediately. From what I gathered - and this may be wrong - is that in Italy, elderly people who already have a lower chance at survival, are put on the Intensive Care beds, essentially filling up places that now can not be used for younger folk, who then die as well. The death toll actually goes up if you try your best to save people with little chance, by not having the resources to aid those with a higher chance to survive. Sounds pretty terrible to type stuff like that out, but in these situations, I think the health care's goal should not be about saving everybody, because that's impossible - it should be about healing as many people as possible and, harsh as it sounds, this includes not using all your resources on people who are going to die anyway.
^ I don't know if that came across in the right way and I truly do not mean to offend anyone with it. I am not a healthcare worker (teacher here), but I have many friends that are. The situation in our hospitals right now is not nice, but the way our healthcare is organised - like I said, quality of life before prolongation - has actually made the situation more managable here as far as I can tell.