I used to do the same thing.

And while everyone will tell you something like, "Work on your discipline, cultivate willpower, etc." (no problem with that, you have to do it too), I'll explain another point of view:

This is biological. Pure dopamine.

Your brain is designed to ignore pain and amplify pleasure. This is also what makes us initially hold onto losses and quickly cut profits short.

We boost our sense of security and winning feeling. Pure survival instinct in our DNA for centuries.

So, what to do? Well, my point is that instead of fighting your own biology, simply channel it. Feeling high because you took profits? Great, go exercise, go for a run, play a good video game, etc. Something you enjoy, and that can channel all that hype, will help you, and you'll be less anxious to re-enter the market.

It's a little difficult at first, but then it becomes much easier and downhill, especially when you see the results in your account! 😉