Hi Maureen...I really enjoyed your blog. It really inspired me to start my own some time. Don't lose hope...if you're feeding the neighborhood kids with produce from your own farm, then you are a successful farmer. I know lots of people with PDCs who like to talk a lot but have never produced a thing.
As a fellow Kenyan, I can relate to a lot on here - the goat and cattle encroachments, the very dry seasons and how to get your farm through them....and now, the flooding...haha.
About the diabetes, ever tried good old cinnamon...about 1/2 tsp a day should do it. You can spread it over a few cups of tea. Also guava leaves are pretty good with that.
There are other cheaper pdc options out there like Practical Permaculture Institute (PPI) http://www.permaculture-eastafrica.com/kenya/about/
They recently did permaculture installations in some schools in Kakamega, perhaps you can check that out, get some ideas on how to set up some systems at your farm. Would be great to see you have a demo site and start teaching those kids some sustainable farming, nutrition and lots of stuff... also get them to help around...learn on the job. Make it fun for them. These are great life skills.
Again, keep it up. Great stuff!