Welcome back and one week sober is a fantastic achievement.
Unfortunately in life we cannot feel high or euphoric all the time. If we feel like that naturally all the time, we wouldn't feel any other emotions, would we?
The addict in us chases the high so don't worry that you are not feeling so great today. What you are feeling is perfectly normal for a human being. Even a sober one.
You are taking practical steps by following a programme for your recovery. Keep in contact.