Congratulations on your recent surgery! It is a big step to take control of your life and to begin this new journey toward a healthier you. I am almost one year post op and have lost almost 100 pounds. Stay focused and you will achieve your goal.
Protein shakes are what I relied on heavily and continue to drink for breakfast. I used the EAS shakes that you can get at Wal Mart for the first few months. Make sure to check the carbs on them as one has more than the other. They contain a substantial amount of protein and the calorie content falls within the approved guideline. From personal experience I have found the chocolate one to taste the best. As I have advanced toward my goal weight, I have begun drinking the Atkins protein shakes. The calorie contents is 160 with 15 g protein and 2 g net carbs.
I hope this has helped you. I will tell you from personal experience that it took me awhile to eat real protein. For approximately 6 months, the only protein I was able to eat without trouble was shrimp and baked fish. My surgeon informed me to wait on chicken and turkey as those are often difficult to maintain/digest. I have never gotten sick from eating as I maintain the rule no drinking after eating for at least 30 minutes!
Keep up the great job!