In my almost four years of getting involved (just an ordinary holder and part-time trader, nothing so great actually), I am so sure that Bitcoin can be a major source of stress especially if you bought them at a higher price and then the price made some slide. Now, I am not saying that it is Bitcoin's fault because stress in the first place depends a lot on our perception and how we are managing it. But definitely, we can categorize as a stressor at some degree.
On the other hand, Bitcoin can also be the source of "happiness" especially when the coin is having a great time jumping upwards. Certainly, there can be euphoria if in 2020 Bitcoin can go higher that its 2017 ATH. Bitcoin is known for extreme volatility and it can go from one side to the other in matter of hours and days.
No wonder that Steve Wozniak the Apple co-founder
sold his bitcoin because riding the roller coaster stressed him out.How do you manage any possible stress coming from Bitcoin's volatility?
Stress and happiness are both attitudes that highly depend on the perspective of an individual and how he/she does something to turn the tides of his emotion to a more positive one.
The problem with most people who invested in bitcoin way back when its price reached an all time high of around $19,000, they invested impulsively (due to heavy influence of media and hype) without even studying or predicting the outcome in the next few weeks. Unfortunately, people who invested at that price are still at loss even today. Now, how do one approach this kind of situation? This would now depend on how you recover by learning your mistakes and recover them by investing smart. Contemplating about your lost investment would only hamper your growth towards learning.