Loosing control over your muscles, falling to the floor or passing out, and going into convulsions has FUCK ALL to do with panic attacks.
Not even close to related.
I have had the same thing happen to me many many many times except not once ever fully passing out. I'm aware I've fallen, lost control, and aware I'm in convulsions when it happens and it takes a minute to pass then I'm fine. I can make it happen any time I want if I take one too many knife hits of chronic. Ringing in the ears started to become constant, because I smoked constantly. Eventually I started to itch all the time when I smoked and would get a rash all over my body wherever I sweat the most.
Turns out I developed an allergy to weed, (I am allergic to other plants like hay fever, so not really that suprising in my case) and it bothers me any time I smoke now. I can no longer smoke all the time or I live with a rash constantly and crazy itching even if I smoke too little to go into convulsions.
You can become allergic to anything at any time. Just because you never had a problem before doesn't mean you won't have it in the future.
I have since quit and that's that. I can't even smoke just hash without the plant material.
It sucks dude, but such is life.
If you want to test yourself for allergies, scratch your arm so it leaves a good raw spot and rub weed in the near bleeding scratch. If you get a bad itching reaction, swelling, lots of redness, then there you go, you confirmed your allergy.
Scratch tests are how doctors test for allergies.
There's nothing you can do but find another hobby.