A few concerns.

First of all I've been smoking for about 12 years now daily, there have been a few times where I had to take a month off here and there, but for the most part I've been a very regular smoker for quite a long time.

For about the past month I have been experiencing less than an enjoyable time when smoking. It's been more of a really scary thing, just pure paranoia and it seems to linger for 9-10 hours. I remember getting this same exact way when I first started smoking, but how can this be happening now? I've been buying from the same guy for years, and the high is generally the same, it can change slightly obviously, but never anything NEAR this drastic.

This change also happened in the middle of a batch, I bought an oz, and in the middle of the same bag this crazy stuff started happening. It makes no sense to me, does anyone have any idea what is going on? I fear that I won't be able to enjoy smoking again!

You know, I think you might just be due for a break...
it might be something in your life that's interfering (other than the weed I mean..)

some time off would definitely help you identify the issue
anything stressing you out lately?

Yeah, I have a lot of stress, but I have for years now..

Maybe time for a break though.