When I first started out with investing a long time ago I was checking the prices constantly and always felt really bad when I saw red numbers. It took me several years to accept the fact that there will be bad weeks where our portfolio will drop in value, there is nothing we can do about it. It's part of the game, even the best traders have bad trades. That's why it's important to learn how to deal with losses. So far I only used money that I can afford to lose, which is probably why I never lost sleep over it. But if you experience physical pain over your trading positions than something is wrong and you need to change. My advice to you is don't put all your money into one asset. Better to spread it out over several different assets, than the chances are much higher not all investments will be in the red at the same time.