I don't know if this will be helpful or not, but the main thing that has helped me deal with DD's nighttime wakings and my fatigue has been to try to come to peace about it, whether the actual wakings improve or not.
Our backstory: My DD was up every 1-2 hours until age 10 months, still waking 2-3 times a night until 14 months, and finally slept through for the 1st time at age 15 months. It still isn't consistent though (she is now 20 months and she currently sleeps through maybe 2 or 3 nights out of 7), and didn't happen at all for a 6 week stretch when she was about 18 months when her canine teeth were all coming in. And when my daughter wakes, it usually takes 1 hour or more to rock her back down.
Honestly, the biggest thing that has helped me has not been to try to "solve" my DDs wakings, but rather to find my own inner peace with the situation. Its hard to be tired, and I'm finding it even harder now, as I'm pregnant with #2. But I found it felt worse when I was comparing myself and my daughter to other families. Its really hard not to be jealous when I see other families with babies who sleep so well. And it can be even harder when everyone seems to have "the perfect solution" and showers me with advice that doesn't actually work for my particular family. When I finally started to shut out all the sleep advice and just reminded myself that we were on our own path and it wouldn't necessarily look like anyone else's I started to feel a lot calmer. I don't think I realized just how much the stress of comparisons was getting to me.
I do think that DD's language acquisition is helping a little. She can sometimes articulate what it is she wants, and she can understand our replies. If she wants a hug or a blanket, we can help with that. If she wants to go downstairs and play with her toys we can explain "toys go night-night and its time for YOU to go night-night too."
And lastly, it helps me to take a deep breath and remind myself of all the things I love about my daughter when I'm feeling resentful about my lost sleep. It is hard to be chronically sleep-deprived, but I'm trying to remind myself that it won't be like this forever, she won't be little forever, and someday I'm going to really miss rocking her, and kissing her chubby toddler cheeks.
Again, I'm not sure if this is even remotely helpful...I just wanted to let you know that other mamas here understand the sleep deprivation and wanted to share what has been helping me.