A frog which is impacted usually doesn't move anymore and is very apathic.
is your frog apathic ? it's difficult to say a pacman frog is aptahic, as they don't really move even if they are healthy.
But, for example, if you try to take it in your hands, does it try to escape or not ?

After, as said by DVirginia, please, answer to the famous questionnary Trouble in the Enclosure.