Uh? Head retention in the fermenter? That's a new one to be sure. Some have more, some have less, mostly dependent on what kind of yeast you're using, some are low foam, some high etc. Depends on the yeast fermentation characteristics. As for mead having head ever? Not gonna happen without SOMETHING added to it e.g. barley or wheat malt. If it is a sparkling mead, think Champagne, not beer, or in the case of the person who made a cocktail (which is not a terrible idea!) a spritzer. Meadmaking is not like beer, save for yeast and time are involved, no mention of proteins should even be touched upon unless you're getting crazy on fermentation nutrients or working out a strange haze problem involving backsweetening or fruit.
EDIT: Also, you checked gravity after 3 days? Try checking it after a month, maybe two, or not at all until you're ready to bottle. Patience is required with mead, much more than beer or anything else. If you're one of those "it it ready yet?" kind of people who checks every day, learn some ambivalence and save yourself stress and heartbreak. I've had nightmares about fermentations before and lost too much sleep in the early days, now that I don't worry, I'm much happier, and the mead is much better for it.