I have Irritable Bowel Syndrome and I find that a good Sativa will really help with it and calm my stomach, Indica not so much.
Some times when I want to work on something I find my self depressed and apathetic. A nice bowl of Girl Scout Cookies will fix that, once I'm started I will be less critical of myself and more pleased with my progress, allowing me to get into it and enjoy my work. If I have something more Indica I will just sit and watch tv :(
I feel it increases my creativity while stoned, but when I look at the work sober its not as good as my sober standard. I have anxiety problems it doesn't help with that.