Change from Pills to Injection

Yesterday, I did not finish reading diet pill reviews because I had an appointment to my OBGYN that afternoon. I changed my birth control pills and tried the Depo-Provera injection which contains a hormone, progesterone that prevents the release of the egg from the ovary and causes changes in cervical mucus and the lining of the uterus. In other words it is more effective that birth control pills. The problem is it is way expensive than the pill and you have to get it every 3 months. The part that don't like about this injection is aside from the fact it is expensive it is also a hassle going back to your doctor to get the shut and there is change for every appointment you get. The reason why i switch from birth control pill to Depo-Provera injection was the side effects. The injection had side effects too but not as bad as the birth control pill. I also heard that with the injection you get hungry all the time. This would mean that the diet is going to be hard to achieve.