Tamoxifen Shortage?

For the next 5-10 years, I need to be on a pill called Tamoxifen. It lowers the estrogen in my knockers, which helps prevent a recurrence. Last week I went to pick up  my prescription and they told me they were almost out of stock and it was on back order but she could give me 5 pills to last me the week. They called me today and said they are still on back order and the manufacturer doesn't know when they will ship. I started to freak out a little but thought, "okay I'll just try a different pharmacy." I called 6 pharmacies in my area before I found one that had them in stock. What I don't get is how can a medication like this be on back order? It's not a pain reliever or an antacid. It's a pill that saves lives. So of course, I start going to the dark side. I start thinking that breast cancer is becoming such an epidemic that they can't keep up with the number of pills compared to the number of women who need it. Then I went really cookoo and thought it was the government doing it on purpose for population control. They are the ones halting production so some of us don't get better. I don't really believe that, but it did cross my mind. Luckily, I will be picking mine up this Friday. Ha ha, government, you can't get me!