Help! pain!

I am 10 days post op.  Wednesday, at my follow up my doc told me to increase my diet to include some pureed items to my diet.  Last night I had the same meal I had 3 times since.  I experienced pretty sever pain that lasted about 2-3 hours.  I was thinking what did I get myself into.  Today, I am going to cut back a bit on textures and try again tomorrow.  Anyone else ever experienced this?  Suggestions?