Is there medicine for nerves and stress?

Since I was a kid, it seems like I’ve always had overactive nerves. I once had the plexor test and after the doctor saw my reaction he asked my mom “he’s very nervous isn’t he?” 

I now suffer from what seems to be IBS. I get diarrhea and get nauseous if I don’t get 9 hours of uninterrupted sleep. Also, I need to use the restroom as soon as I eat and sometimes while I am in the middle of eating. When I have to use the restroom, it’s urgent. I cannot wait and need to almost always have a bathroom available next to me. 

Also, when I get diarrhea and sometimes before using the bathroom, I get this sort of stabbing, nerve like, weird pain in my rectum. It lasts between 1 and 3 minutes. During that time I have to hold on to something and it gets worse and worse during that time and then goes away and then comes back one or two more times. It almost always goes away completely after I use the bathroom or pass gas. 

I take some pills for IBS but they don’t usually work when it’s due to lack of slee

I do wonder if this condition has anything to do with my nerves and stress and if there is anything I can do about it since sometimes it’s impossible for me to get at least 9 hours of uninterrupted sleep. Last night for example I got a text at 3 AM that woke me up and I had to talk to them (customer service) for about an hour and a half, otherwise they wouldn’t have solved my $450 issue. Today I am nauseous and feeling horrible. 

Anyone else has this? We’re you able to solve it? How?