Revenue and traffic are two different beasts, so did your traffic fall off after switching over to a secure version of your website ? Or did your revenue to a particular program fall off ?
If your revenue fell off, that's a lot harder to piece what might have happened, for instance if your buying traffic, but have a small amount of SE traffic, maybe the traffic your buying is shit, and it's only the organic traffic that is really doing any sales. If that is the case you would have to really dig down on your GA to see if SE traffic fell off after the switch. Whenever you make changes to your sites, you need to give it 60 days to balance back out before freaking out
So it would take a lot more details than either of you gave to diagnose what may have happened, and I wouldn't suggest that you give out that info here on an open forum. Find someone that you trust and let them look at your numbers to see if they can spot what may be up
