You need realistic goals. 2½ st lost in 10 weeks isn't likely in my opinion. Possible but unlikely.
If you are about 14 st at the moment then you are in the same position as me and I'm having problems encouraging more to come off.
Avoid these extremes of "I'm going to lose the lot in the time I say" and "I'm going to eat myself to death". Really, they aren't helpful.
To reiterate others, this weight will have taken a long time to go on, it will take a long time to come off. The body doesn't like change, you have to gradually convince it not to compensate for the smaller amount eaten by slowing down metabolism, it needs to be coaxed into setting a different weight as being "right". Time and again.
Go find a sensible eating plan, one you can stick with long term, and stick with it. and expect a year or so before you approach your goal.
Oh, and consider contributing to
http://www.theanswerb.../Question1121202.html on a regular basis ?