It's a disease, and cures tend to not be found super-quickly. That's not scientists or pharma or whatever dragging their feet; it's due to the fact that scientists try tons of different combinations, then they re-test them. They control for as many variables as possible. They study their results. They publish and their work is peer-reviewed.
This takes a bit.
PS About the government suppressing stuff... the government and pharma are made up of people. Lots and lots of people. Anything that big that was being covered up would be the sort of thing that an enterprising lower level employee would try to sell to the tabloids. And don't say the board of directors would keep it a perfect secret, because someone always messes up. They fail to shred something thoroughly, or they keep talking when the caterer comes in with a tray of food.
This doesn't mean the government is utterly devoid of secrets. It's more that big, juicy secrets like that are worth big money to the tabloid press and as a result they don't stay secret for long.