Become more clingy to my fiancé?

Kristina • Getting married on 6/20/16
So my SO and I were seperated for about a month due to physical distance. I was in the hospital in another city due to mental illness. When it came close for me to come back home, I noticed that I started to have really bad insomnia. And I feel like I have to be around him all the time, and when I'm not I either get bored really easily or I just vegetate on the computer or video games. But when he spends like 10 minutes cuddling with me in bed, I fall asleep really fast and I just feel so much better when he's with me. I sleep the best when I fall asleep next to him. And its always been like this a little bit (I'm a very clingy person in general thanks to borderline personality disorder), but its just gotten so much worse and its weird. Why do you think it could've gotten worse?