I used to take stimulants all the time when I was healthier. I liked them a lot. My favorite was, crap can't think of the name. I'm trying to remember. Got it Focalin. It worked for about 5-6 hours, had a slow taper and had a wonderful side effect of a good mood. I could not take long acting ones. The stayed in me for almost 24 hours and when it started to wear off I felt crashed but jittery.
I also tried Modafinil but I don't remember it doing much for me but I know some people really like it.
I think now, because I'm so fatigued all the time, it would not be good. Like you were worried you might do too much and then crash. If I was going to take something now I'd take a short acting one so I wouldn't have to deal all day.