I've been using Clear non-stop for 5 years. I have two dogs that also started in 1998. I noticed nothing from them until day 10 -- then big changes. They passed tape worms on day 10 and went from lethargic to bouncy and energetic immediately after that happened.
For myself, I had results the first night, my wife took 2 weeks.
I'd stick with it. Considering your body weight, I'd take more caps for a month or so.
How much Experience are you taking? Work you way up to 6 caps a day for at least 90 days. It's best to mix up in warm water.