It’s really an interesting question.
So, what follows is just my point of view, but perhaps we can think about your question in an other way. What if it was less about having enough strengths to be patient and more about the way you may be defining happiness for yourself? And what if this position of waiting for brighter days was reducing your ability to perceive the positive in present days?
Just to be clear, your question is entirely legitimate and by saying that I don’t try to minimize what you’re living or the difficulties you’re experiencing right now. Not at all. I only suggest that, sometimes, it can be interesting to question our own representations so we can see think about our situation with a different perspective.
I don’t know if you enjoy reading, but maybe “The Wisdom of Insecurity” by Alan Watts could be an interesting book for you. I retrieved two quotes from it that I had written for myself at the time (sorry if the translation isn’t perfectly right):
“The power of memories and prediction is such that for most human beings, the past and the future are not as real, but more real than the present. The present can’t be happy unless the past has been “cleansed” and the future is full of promise.”
“If my happiness at this moment is essentially to give me good memories and make good forecasts, I have only weak awareness of this present. I will still be imperfectly aware of the present when the good things I had expected will be over. Because I will have the habit of looking back and forth, it will become difficult for me to pay attention to here and now.”
Just found that, somehow, this was resonating with your message.
I’m sorry if this isn’t directly helpful for you or enough concrete regarding the question you asked. These are just some thoughts I had while reading your message.