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Worth noting that the letter writer apparently has three children aged six or under. Which means that at least two and possibly all three of them are probably home with her 90% of the time.
As any parent can attest, young children are glorious, but they are also very, very draining. Three young children could be very, very, very, very, very, very draining.
Most of the parents I know (myself included) had at least one period when their children were young that all seemed hopeless. Perhaps it was post-partum depression, perhaps it was just the day-in/day-out unrelentingness of it all.
But kids will get older and more independent. And in that way, the LW's life really will change. Other issues will remain, but perhaps the LW's needs won't have to compete so fiercely with her reality.