I have a Ball whose exactly like that. He hates his head being grabbed. Getting a secure grip on both sides of the head may just be enough, but you can also check for bubbles by pulling down the bottom lip on both sides of the mouth. Basically checking the gum area; bubbles will show on the sides of the mouth if he's still got an RI.

Since you finished the medication he may be in the clear and bubbles may not show by checking that way.

Also glad he finished up the medication . It's truly a good feeling once that's out of the way.