i often get very strong emotions over things, usually it is frustrating things that cause me to 'flip', i thought for ages that something was wrong with my emotions, but my social worker often reminds me that i am reacting to my situation (which is pretty bad)and actually handle it better than most other people would and that it is ok to flip at times, infact she would be more worried if i didn't!
like you I too can find a situation amusing one day and be really p'd off at it the next, it depends on how tired I am, if i am in a hurry, my pain level, and how the person with me is handelling the situation too, many things can influence how i deal with a situation. some days i wake up simply feeling down and struggling to think clearly and i know that all day everything will p me off no matter what it is or how well it is done, those days i tend to warn my carers that i am in a foul mood and that if i snap at them not to take it personally, or i take a duvet day and stay in bed because it is usually a sign i need to sleep or rest.
i hate the fact it is so unpredictable, and have on a couple of occasions had to leave a meeting because my emotions got the better of me and i started to cry over something that had really frustrated me before the meeting started...very embarrassing, but luckily my collegues are very understanding and know how difficult things are for me.
i feel like i have little control over my emotions even when i try really hard to be ok, if something upsets or frustrates me it is impossible to hide it, but hey at least everyone knows exactly how i am feeling and what i am thinking, there is nothing hidden in me!