I get paresthesia and it can be pretty painful. So I describe it to people as standing in a hill of fire ants. For my pounding heart, I describe it as being repeatedly punched in the chest (which resulted in my now ex-husband punching himself repeatedly in the chest and telling me it wasn't that bad. That's not a normal response by any means but it definitely illustrates the lengths people are willing to go to prove you wrong about how bad this stuff can be). For what's not really vertigo but still ends up being some kind of dizziness, I liken it to walking on a boat before you have your sea legs. For blurry vision, it's like opening your eyes underwater. For my muscles spasms, especially the ones in my hands, I tell people it's why I'm so good at opening pickle jars: my hand just will not let go. It is currently trying to crush my phone as I write this. For when my legs feel very suddenly weak, it's like somebody came up and kicked me behind my knees. It is really hard to stand up if somebody has done that to you. Sometimes my voice doesn't want to work. I sound like I'm deaf. People will treat me like I am when that happens. When I describe it to a doctor, it's like my mouth is entirely filled with peanut butter. And finally, because I heal so very slowly and am suspected to have ehlers danlos, I explain my poor spelling and grammar on the fact that I am currently typing this using my voice (which works most of the time now) due to a violent shoulder injury.
I personally have found that likening it to inanimate objects doesn't get me too far. But that is definitely a personal preference. It doesn't make the explanations other people find useful any less valid.