How do i know if i have bad short term memory?

state some examples of bad short term memory.

for example;

one moment the phone is next to you, and the next, it's not there. where did it go? is what you're thinking, and you always think you just had it, and who moved it, cause you would remember if you had moved it, right?

with short term memory, you did move it, but you don't remember doing it, and so everything around you appears, and then, seems to disappear.

Another example;

You’re driving down the street, but you can't remember if the numbers are going up, or going down even though you are reading them, and so you keep turning around in parking lots, and going the other way because you also can't remember if the numbers “should” be going down or up.

it's tough, cause you can't even keep up with easy conversation.

hope this helps, but mostly hope this isn't your case

thanks