Cymbalta was increased now I feel like I am on speed!

Hi all, 

I have been on 60mg of Cymbalta for a year or two now which at first did appear to help my depression. About six weeks ago though, all my depressive symptoms came back in a rush for no apparent reason, I tried to ride it out but it was getting to the point where I didn't want to get out of bed again, so I went back to my doc. My doc increased my Cymbalta to 90mg about 2 weeks ago, ever since then I have felt like I am on speed. I never had this feeling with the 60mg but now I find that my energy levels are higher but on the downside I cant sleep at night, I am having bad mood swings, and that horrible speedy anxious feeling. It is hard to describe but it feels just like being on a strong dose of duromine (although I still have an appetite) and the effect seems to be increasing with each day. I am on annual leave at work for the next 2 weeks whilr I try and sort myself out, I don't know what to do, I would not be able to go back to work with this speed feeling, but I am hoping since my dosage was only increased 2 weeks ago that the side effects will reduce soon. Has anyone experienced this before? My doctor said to see him in a month when he upped the dosage but do I need to go back sooner or is this normal? The mood swings I am now having is what bothers me most, depression is one thing, but when you're swinging from feeling high to feeling incredibly low I am worried about the stupid things I might do. Any advice you can give would be really appreciated  my doctor is hard to get in to but I will make the effort if I have to. 

Thanks, 

Megan