Once you get past the present problem, think PRECAUTION.
In over 17 years full-time liveaboard I learned a thing or three about marine heads. After several very nasty clogs of the macerator and other parts, I adopted a very hard policy aboard my vessel:
NO TOILET PAPER OR OTHER MATERIAL IN THE TOILET
PLACE ALL MATERIALS IN THE SMALL WASTEBASKET NEXT TO THE TOILET
Use small plastic bags to line the wastebasket. Guests are told they can use all the toilet paper they want...just ball it up and put it in the wastebasket, not the toilet.
I have signs to that effect in my head, and whenever a new guest or crewmember comes aboard I ALWAYS go thru the proper use of the toilet with them, including the policy of no paper or other material in the toilet.
It's now been over 15 years since I adopted that policy, and I've had no (zero) problems with head clogs.