Going with the current or flow of life seems to be a teaching of many ways of life, including Sikhi
I am not so sure, the current flow can be wrong, look at Nazi Germany, I like to think Sikhism advocates a life of alignment with truth, and mostly the truth does not seem to run hand in hand with the current flow.
Again and again in life though, we resist that flow. Things happen in life which are difficult to accept or make sense of, and our flow becomes disrupted.
could it be that we put too much weight on the happenings of life, difficulty in acceptance is relative, someone may find it difficult to accept the house they live in, the car they have, their status, and spend many moments worrying about it, not that I would put yourself in that camp, some find it difficult to accept their family being wiped out in a bomb, two extreme scales of difficulty, all dependant on circumstance, maybe there is a state of being that sees all as the same, where circumstances no longer define you, nor time, nor fashion, nor public opinion, just the truth, and when I say truth, allow me to define it as I know it, truthful living, not merely restraining from lying, or doing 'bad things', but I would say your agenda must be truthful, rather than your actions. If anyone wishes to debate this, please ask, I will open or reinstate a relevant thread.
Whether we have been disappointed, hurt, failed at something, didn't accomplish a goal, or our egos have been bruised, we can get lost in this perceived misfortune. How can we learn to accept?
well logically I would say it would be to have no goals, no egos, no perception of misfortune, not a desire to suffer, but a refusal to suffer, a refusal to accept sufferance, I am not sure completely.
How can we learn to accept?
I find not wanting anything helps, and then just focusing on what life has to offer you and what you have to offer it, life changes, you could be in a refugee camp one minute, a crashing plane, infected with HIV, about to lose your house, about to get married, to have a child, there is nothing in that list that particularly worries me or makes me excited, failing on my part probably, but if it were to happen, I would deal with it, enjoy it if it were enjoyable, and just live, as best I can, you are possibly at the start of your life, such a journey ahead of you, me, nearing the end of mine, lots of memories, lots and lots, I am not waiting to die, I just accept each day day is an adventure, and as long as I am in charge of what pleasures me or saddens me, then I am ok.
And how can we prevent ourselves from falling out of the flow in the first place when dukh or misfortune arise?
Personally, follow the flow of truth, its hard, but you won't fall out, unless you wish to.