Shaver's Remorse 

When a Person regrets, or rues shaving any attatched hair from their body.

mannnnnn i really miss my hair. I think I have "Shaver's Remorse."

Shaver's Remorse by kkkkiller July 8, 2010

Saver's remorse 

The feeling of regret after one has controlled their impulse to buy something (usually expensive), and then later returned to the store, only to find that their intended purchase has already been bought by someone else. The opposite of buyer's remorse.

Jack had serious saver's remorse after he returned to Nordstrom to buy a sick pair of Rock and Republic's he saw a few days ago, but found that they were completely out of his size.

Saver's remorse by r&r_metro December 9, 2008

sharer's remorse 

The deep sense of regret that washes over you when you realize that you’ve shared something stupid on social media; especially prone are those who share articles before reading them.

Sharer's remorse washed over him as he realized that he was one of the first people to share a fake-news story that went viral.

sharer's remorse by Dictionnaire Diabolique January 23, 2017