Psychedelics definitely can produce strange thought patterns, but I find they do so in different ways. LSA gives me this runaway thought explosion where my mind is going 1000 mph and is producing new thoughts faster than I can identify them. This can definitely be overwhelming, but if you just let go and let it happen you'll be fine. Interestingly MXE does this for me as well.
AL-LAD produces a similar but totally pleasant effect where one thought quickly leads to another, but it has an order and logic to it. It's much more manageable and can be just exhilarating.
Mushrooms do this in a more organic feeling way where I find my mind just moving from different thoughts on it's own and I just forget the previous thought. It's befuddling, but not anxiety provoking.
I've only done low dose LSD, and it just gave me a fuzzy, blissed out love feeling. At higher doses, I don't know yet. It seems to me every drug has its own character in this regard.
My advice to you is wait to drop the tabs until you're in a less anxious state of mind. Letting go and not fighting the effects is crucial to a good trip. I highly doubt you'll have a bad time, in my experience marijuana is far more likely to induce anxious and paranoid states than classic psychs. But you do need to be prepared to accept and adapt to whatever mind state you get thrown into. Just be positive, accepting, and curious.
I'd also recommend testing your tabs with ehrlich's at the least if you haven't already. Knowing exactly what you're putting in your body is a very calming thing for me.