Hey man, funny that I saw this today. Believe it for fucking not, I'm literally on the same meds AND dosage as you! I do not take buspar as of right now, but I did in the past and have never taken LSD while being prescribed. I now have substitued with Welbutrin but that's not the point. I have taken LSD about 4 times and every time I have tripped, each time being different though. When you took the LSD the last two times and noticed the different effects, did you raise your dosage at all? What you explaned orginally happened to me. First 2 times very strong, but the last 2 times, not as much. I thought maybe it had to do with the meds. But before you even think about the meds, I would consider the dose of the LSD in general. I called my friend up and asked if the last stuff I had was from the batch I had before and he said no and then confided in me that some people and complained of it being weaker. That's what I would consider before the meds.
As for stop taking them to try and trip, I'm not sure how good of an idea it is. Buspar would be fine in my guess. I have stopped taking it on and off for years with no effects. The lexapro is more tricky. I find if I personally skip a few days, it can get hairy. And for the depakote, I use it for Bipolar Disorder, so in my case if I skip it for a while THERE IS HELL TO PAY. As for headahce, Im just not sure. I'm planning on having a little trip tomorrow. I will write back and see if anything happened with the same dosage I am taking! Have a good day