As someone who takes antidepressants, namely Wellbutrin, it has been my experience that the side effects vary from med to med. Some of the side effects for Paxil were unacceptable to me, but the switch to Wellbutrin was pretty easy. Meanwhile, I'm also taking Chantix to quit smoking, which isn't dissimilar to psych meds, and I've been having the craziest, most vivid dreams ever, be they pleasant or nightmarish.
I guess my point is this: Side effects happen. How acceptable or not they are varies from person to person, but also is a bit in the eye of the beholder. When it comes to psych meds, if one person who needs psych meds describes taking meds as "horrible" to someone about to take them, is it at all possible that they are helping craft the experience for the next person down the line?
I know that heavy drugs, like lithium, are said to create a muffling effect on the emotions. I've been told this by people very close to me, but Wellbutrin, for me, has been so...gradual. I started taking the meds, without side effect, but over time the effects were showing, and it was almost as if I didn't see it happening in the meantime. There was no sudden click. On the other end of the spectrum, if I miss my dosage for say, a week, there's no violent exit, either. I just slowly become sick of weird shit, like having to use alarm clocks, in a really childlike way.
Just my 2¢