Anxiety when away from my SO

I'v never really had anxiety, expect for when I was very young and it eventually went away as I got older. Over the years I'v been with my SO it's started up again and for some reason it's flaring up more than ever. I'v had more than a handful of anxiety attacks when my SO has to leave in the morning for work so bad he can't wake me up anymore for a goodbye kiss or anything. I don't know why. I feel like he thinks I'm needy, but truly I am not I try to not make it into a big deal, but he hasn't complained or made me feel bad, but I feel bad in general because I feel like I'm over reacting even though I can not help it. Any suggestions lady's that may be dealing with the same situation or any helpful ideas?