I have been feeling really down recently, despite being on medication for 6 weeks now (75mg/day Dosulepin)

The thing is, although I had a bit of un-nerving news yesterday, I don't really feel down for the last few days, I just feel really on edge at the moment

Anxious, nervous, like I'm dreading something, afraid to be awake or asleep, just on edge

I don't have anything to worry about at all but I feel so irritable and I can't sleep for more than about 4 hours a night.

I don't feel tired but I am exhausted and I can't concentrate on anything, even reading a newspaper

I haven't had problems with anxiety for a couple of years now and I can't remember if it feels like this, I feel like I'm going crazy and my head is going to explode.

Does anyone ever feel like this?