Select the icon of your startup volume ("Macintosh HD," unless you renamed it) in the sidebar of a Finder window, and open the Info window. How much space is Available? Specify gigabytes (GB) or megabytes (MB).
I don't want to seem overdramatic, but in system information the amount of free space is increasing in small increments over time, is this normal for a situation like this, and also, will it ever fix itself? I really appreciate your help!