Hi, Kelly - I'm new to the forum, but have dealt with this disorder for about 25 years. I finally got stable last year.
Anyway, I felt exactly the way you do when I was on Lexapro. In fact, I felt that way on ALL SSRIs. My pdoc kept telling me SSRIs were bad for bipolars, increase or bring on mania but me being the know it all, insisted.
Finally, I took her suggestion to try Lamictal. I didn't really think it would work on depression that well. Whoa! It took a while to get to the therapeutic dose, but it worked way better than any antidepressant ever did. No manic type side effects like you describe.
I understand exactly how you feel - you really should consult your pdoc about it - you probably need an adjustment. Stay in contact with your doc until you are stable, and watch closely for warning signs.