First of all if your weed was brown in color and has seeds o' plenty, you aren't smoking good weed. The green stuff with the orange hairs sounds like good MJ though. I have heard a lot of stories similar to this. All that happened is that you smoked some really good weed and weren't used to the high.

A 5 hour high is nearly unheard of though.

Skunk, from what I understand is just slang for good weed by some.

As for feeling the effects a year later, that is just your mind. There are certain smells that make me remember old memories etc.

I wouldn't be worried, it just sounds like you were used to smoking low grade weed, so when you smoked good stuff, the high scared you.

Just my two cents.

Than again, the weed could have been laced, but again, that is very unlikely.