Well, IME, weighing doses is a very important practise. 10 mg for instance is a very small amount of crystal, so your comfort zone may be 20-25 mg for instance, but you have eyeballed 35mg thinking it was 'about the same as last time' - resulting in an overwhelming and uncomfortable experience. My advice is to definitely invest in some scales before dosing again, and find your 'sweet spot'...

It is also worth noting that Spice will not always be insightful and jaw droppingly beautiful, it has it's ugly side too, and you have to be prepared to deal with that from time to time. Make sure you take time to integrate before delving back into these realms, and I am sure your next (weighed!) journey will be much more pleasant.

I can't comment on the opiates as I have never taken them though, sorry.