The most difficult emotion to control

Anger and desire for me. Normally, anger is more difficult to control, but if I want something enough, I find it nearly impossible not to go after it.

Desire is a bitch to handle at times. Today my job required me t stand in an elevator to take up prospective freshmen and their parents for tours of the dorms, while my RA friends/coworkers were playing in the snow! I also have something of a crush on one of the RAs, whom I am close friends with. I had to stand in the docked elevator, watching them run around and have a blast together. Sometimes I really hate being left out of group fun, because I fear that will bond together in a way that makes me an outcast. I generally am a loner and I'm trying to remedy that. So yeah, desire sucks. Also, I hate when I desire cigarettes or other substances. I only give in a few times a year, but the fear that I'll cave is enough to bug me thoroughly.

more like an anxiety, jealousy type thing

It used to be anger for me, but I've learnt to control it better. I cannot control being embarrassed though, even if I try to justify to myself at the time, and the feeling won't go away for 0.5-3 days.

Definitely sadness. When I'm sad, that's it! I'm upset! And it will take awhile to calm down. I calm down quicker when alone.

Anger makes me feel very out of control, but I rarely/never express it. I think I'm fine at controlling the others--although sometimes when I'm in a silly mood I have a hard time containing my amusement.

Fear, because of my inferior Ne.

I don't have any difficulty to control any emotion...

Fear.

When I read all the previous answers, like jealousy, anger, desire, embarassment, I wonder: Doesn't worrying about controlling these other things all stem from fear?

Fear of betrayal (jealousy)
Fear of a loss of situational control (anger)
Fear of romantic rejection or "sexual harassment" charges (desire)
Fear of social rejection (from doing embarassing things, like laughing inappropriately)

Agree? Disagree?

I must not fear.
Fear is the mind-killer.
Fear is the little-death that brings total obliteration.
I will face my fear.
I will permit it to pass over me and through me.
And when it has gone past I will turn the inner eye to see its path.
Where the fear has gone there will be nothing.
Only I will remain.

-- Frank Herbert, Dune

I don't generally have a problem with any, but when I feel I've been wronged it very much sticks with me, and if the wrong is of great enough an intensity that I get angry it is extremely hard to let it go.

Though I can be intensely fearful about certain things, sometimes. Sensitive to rejection and all that.