Is there a good way to describe how I feel when I'm low?

I've been a t1 for over five years now, and my family has always asked how it feels to be low. I always say, "It's like my legs feel shaky." (You'll know what I'm talking about if you feel it) but I feel like that's not the best way to explain it. Another way I use is "Like I just came off a scary rollercoaster." But it doesn't feel exactly like that. When you get low do your legs feel "shaky"? If not how does it feel? Is there a better way to describe it? Let me know :)