I feel your frustration
DS has been having one, sometimes two 30 minutes sleeps each day for the last couple of weeks. It's just not enough for him, but I could never get him back to sleep. Suddenly, today is like he's playing catch up. He's currently down for his 2nd nap of the day and both have been over an hour. When he wakes though, he's up and that's it. There's no re-settling him.
I hope it gets better for you soon, but just wanted to let you know you're definitely not alone!