I'm 19 years old and I tried the depo shot and I hated it. I have only had one shot and gained 20 pounds!!! I'm moody and have such bad migraines after taking the shot. It made me sick and misreable. I was supposed to go back to take my shot in October but I didnt and still no period and I haven't had one the whole time I was on the shot so it has almost been 5 months with no period. When should I start again?