With every high, you will get some lows, and sometimes it will feel endlessly low. This is why you absolutely must take as many benefits to smooth out the bad times.
There will be times when you are really looking forward to your holiday but your boss will cancel it a week before hand for operational reasons and they won't say sorry, they'll just say 'life in a blue one shippers' and expect that you had travel insurance that will repay you. You don't get to complain about it, its part of what you sign up for. You might be expected to sit outside in the pouring rain and you're really tired as you've not had a day off in weeks. Theres going to be times you will have a sense of humour failure about it all and really just wish you could go home and not have to live with a bunch of what feel like chimps for colleagues, with the added insult that you are showering in cold water in the middle of a South Atlantic winter. There is going to be a time when someone shouts at you for something being done 'wrong' and it feels a little bit more like they are taking their own frustrations out on you because no one has been allowed to speak to their family in 7 weeks and on top of that, the work is both tedious and monotonous. You still have to keep your morale up because your own team depend on you for direction though, and it will all fall to pieces if you slump into negativity.
Sometimes; you're going to work for an incompetent boss and you'll clearly see he really doesn't care because its his last draft before retirement and all he cares about is making sure he turns up enough so he gets his pension as planned. It will seriously make you wonder how the hell he got promoted into his rank in the first place and make you feel that the promotion system makes a mockery of itself. You'll need to outwardly respect him and try and keep the place running though, because if you don't, something is going to go seriously wrong. It would be nice to make things better but he won't let you make any real changes because it might make a civvy whose favourite phrase is 'we've always done it that way' cry about it and he can't deal with public displays of emotion, particularly since the crying woman wants to have closed door chats with him every time she feels a bit aggrieved.
The times like these are the ones where you just need to take a deep breath and remember that you're still going to get paid at the end of the month. Its also the days that you need to ask yourself why you are here, and if you are not doing anything additional on top of the basic functions of your role to better yourself, for yourself; then you need to assess why you are bothering to stay. Having cheap education and time off work to go to the gym should be one of the drivers behind why you put up with the rubbish parts. Get yourself as qualified as possible for the day it really all does become too much despite the pro's and you decide to click the 7 buttons of freedom. You will have a decent resettlement package if you've been in long enough and its an incredibly useful bonus, but I promise you that you will regret not using SLC's every year or taken advantage of cheap adquals when that time comes, especially if you need early release and can't use all your resettlement entitlement.
Some people were in this job for their whole career as the pension trap kept them going; but the younger generation doesn't have this luxury and need to be ready for a second career despite having just dragged themselves through a 20 year career characterised by repeated gulf deployments and manning shortages. Don't waste the few chances that remain for you.