Lloyd, there will always be ticks and there will always be Lyme Disease.
You are truly blessed by having shaken it entirely!

All you can do is use those nasty chemicals you refer to to minimize exposure but there's no way you can ever be entirely tick-free when you go out into the woods and fields where these little bast*rds live. Perform personal tick checks (including with a mirror for those hard to see areas) every time you come out of the field. Tick checks with a wife or girlfriend can be a lot of fun.....