Empty

So last night, I was watching some sports highlights before I went to bed. Just after I turned off the tv, I got this huge feeling of just being empty, and that I'm all alone, and it just made me depressed. It was so bad that I was almost dropped to my knees and broke down. I was fighting just to get ready for bed and get into my bed. I have no idea what caused it either. It sucks. I haven't broken over it at all yet, but I feel like I may just snap and start crying soon. I don't want to though. I'm tired of feeling weak about stuff like this. I just want to be better...