day 3 of 10mg, worst breakdown in months

I started on 5mg for two weeks. I felt nothing on that dose, but got tapered upward to 10mg. After 3 days of taking my 10mg dose, I had the worst breakdown I've had in months. I couldn't stop crying for about an hour or two, nearly straight. This wasn't really triggered by anything specific. I had to leave work early because I was genuinely in so much agony. The entire time, I kept thinking "What did I do to deserve to feel this horrible." I felt better after I left work, but now I'm worried about going back. Is this normal this early into med taking? My doctor warned me that Lexapro could make me feel worse before it makes me feel better. I just haven't found a lot of other anecdotes about the med making other people feel like that.