Yes, I think I've had quite a bit of what you've written down. I don't usually have panic attacks, but quite a lot of thoughts you have.
Like if i get mad/irritated/sad or yell or even any of my quarks (like everyone has) i immediately think the worst and the thoughts feed off of that and then they all flood into my head.
I'm not sure if this is what you meant, but I'll give it a shot anyway in case you can relate to it. Whenever I get angry or irritated-like, say my mum's nagging me to do my homework every five minutes, or my friends promise they'll do something and they don't-I immediately assume I can't be angry about that, because being angry means you're going to snap and do something awful, and that if you're angry you're going crazy. And if I ever felt down or sad for whatever reason (sometimes there's hardly any reason at all), or if I wanted to stay in bed for a few more hours, I'd immediately assume I have depression, so I'd try so so hard to cheer myself up and I'd get out of bed early to prove to myself that I don't have depression. And of course when I'm trying very hard to be happy and my mum's nagging me to do my homework or my friend's say they'll do something and don't, it all adds up and I get angry or irritated with everyone aaaand the whole thing starts again. ^^''
The thoughts are often repetitive/obsessive, they are all mostly about the same things/subject.
I honestly have no idea if this is true or not, but the way I see it is that OCD feeds off of what you're the most scared of-so for example, if you have a fear of germs, OCD will feed off of that, and if for some reason after a few years or something either your fear of germs decreases or another fear becomes bigger, OCD will switch over to your new fear and start on that instead. So if you've got a very big fear-for example, mine's death-you'll be obsessing over that the most.
I think of these things and they really make me scared and the more scared i get the more the thoughts get worse and my mind at that point has like almost convinced itself of something and i end up sitting there and dig deeper and deeper and then i feel nuts.
That will go on and on for most of the day.
It's almost like...say I told you 'think of pink bumblebees dancing with sheep in a field.' You're immediately going to think of pink bumblebees dancing with sheep in a field-I'm not exactly sure why, there's probably some confusing scientific explanation out there somewhere-but everybody would think of pink bumblebees dancing with sheep in a field. So when you're getting scared of your thoughts, many people want to stop thinking the thoughts-and so of course, your mind helpfully pops up the thoughts again. It could also be that because you're getting so worried over them, your brain flags those thoughts as 'important'-such as the thought of 'I'd better look both ways at a road before crossing' is flagged as important, so you do it automatically.
You're not going nuts, at all. People who are genuinely 'nuts' either don't know they are, or don't really mind. The fact that you're so worried over it is proof that you're perfectly sane.
Have you tried distracting yourself? Like, watching your favourite film or reading a good book? It might take a while for you to fully get into it with your thoughts going off and on all the time, but it might help.
Sorry if that was really unhelpful