That's part of being a trader and an investor, if you're not prepared to miss those gains and have them yours as losses then that means that it is not for you. Every time you think of those missed chance and you do no action on it, this will make you feel regret at most times. But you know what's the best choice is just to be a holder at these times so you won't be taking the whole pressure that you'll get from the market and at the same time you just chill out while waiting for that gain and by that, you won't have those interval losses. Well, when you enter this market, you need to have a plan of getting in and out but for the most of us here, there's no getting out as this is an unstoppable journey and this bitcoin(train) will just keep on pushing forward.