Im in the same situation..Im in college, and all I do here is work hard during the week to do mediocre in class and get hammered on the weekend with my friends.
I had a great sense of humor a few weeks ago coming back of spring break, I had an awesome time, opened up to people i normally dont and it carried over to the next two weeks or so. But its gone now, I force laughter and small talk, try to be clever and have fun, but its not the same at all.
I dont think its depression were feeling, but maybe stress and a disconnection between friends, which leads to not talking as much and turns into a vicious cycle.
-Im stressed for school and am constantly doing work during the week, or eating or watching tv.
-During the week I barely talk to anyone in my frat except closer friends, and even then they ask where have you been?
-On the weekends I usually drink with friends outside the frat, I get hammered and have a great time.
-I relax when I drink, and gain confidence so I laugh at myself and others and its lighthearted and usually everyone has a great time...but sometimes i think im a little dependent on that, I want it to carry over to sober me! atleast I know its still there.
Im pretty po'ed I cant laugh as easily as I could, or make jokes and laugh with others, it makes me angry I cant enjoy life like i used to or even make others laugh.
I think alot of it has to do with stress and a possible dependency on alcohol use.
I also think that to laugh you have to connect with something on a personal level, which ties in to connecting with friends.
A few things Im going to try and have heard worked for this:
-watch alot of comedy, find out how others look at life and twist it to make it funny, watch comedy central before bed
-when you wake up force a laugh and try to keep laughing until its genuine, this relieves stress and helps you smile again so its not as tough the rest of the day
-for stress go to the gym and try to make it regular, or try whatever theres alot about minimizing stress on the internet
Just right now I remembered all of this since last time I lost my sense of humor haha, give it a shot I hope it helps
And thanks! This really helped for me, so you helped someone today