Don't speak. Whispering is WORSE than talking when you have laryngitis.
Rest your voice, no screaming, or singing. Get plenty of rest/ sleep. Avoid dusty areas. Gargle with warm salt water. Avoid spicy foods. Stay away from anything deep fried.
There's a yoga facial position that might help. It's called the Lion. Google it. Looks funny as hell. Works best when performed while on your hands and knees while at the same time exhaling a breath. Repeat a few times.
Definitely rest your voice and avoid forcing communication. Failing to rest your voice so that it can properly recover might mean your voice will forever be compromised.
Silence is golden !
Stop talking, and if it from allergies take some allergy medicine.
Stifle it for awhile.