IBS is like any other condition, it can get worse or better. For myself, getting my anxiety under control really helped get rid of the cramping and gas pains that I was experiencing with IBS. I still have loose stools frequently, but once I started taking Lexapro for my anxiety it helped cut the edge off of it.
From the sound of it, I would guess you might need to get your stress and possibly anxiety under control as well. You might start with going to a counsler... I'm not trying to push anything on you. All I know is that it worked for me, it may not work for you, everyone is different. Sounds like you have a similar problem though.
I had severe IBS years ago when I was going through a very tough time with my ex-girlfriend. I too constantly had to run to the bathroom where ever I went. It was ruining my life. I don't know what medication you may be on but my doctor at the time put me on something called "Levbid" that really did the trick. It slows down the bm's amazingly! After a year of taking it I realized that I no longer needed it. It's been about 5 years since I went off of it and I'm doing great! I'll probably always have to go a bit more than people I know but it no longer ruins my life. You may want to ask your doctor about "Levbid". Just know that there's a good chance that you will eventually overcome this on your own. Good Luck to ya!