You might try hot decaf herbal tea - for some reason the warm drinks seem to keep me feeling full.
Also, I don't know how long you've been on but sometimes it's a matter of breaking a habit. If you have always snacked in the afternoon (and I'm a notorious afternoon snacker!) it may be that you just need to break that habit. I keep a big bowl of lettuce on my desk just for that purpose - if lettuce doesn't sound good, you probably aren't really hungry, just mouth hungry.
A dill pickle spear can help too.
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Nothing is impossible. In fact, the word itself says 'I'm Possible'! - Aubrey Hepburn