I haven't done Clomid either, but as for an IVF cycle, it depends! I'm halfway through my third cycle.
The first I found very little in the way of emotional upheaval. That was in 2004 and resulted in DD.
The second was over the last christmas break, and was very difficult. I was sick with the flu and then some gastro thing, and my in-laws were staying. I had horrible headaches, was very emotional, and very uncomfortable. I have no idea what was tied to what - was it the sickness? The drugs? My MIL? All three are valid reasons
Either way, our embryos all died in vitro before they could be transferred back.
This cycle, I haven't started stims yet, but I'm on suppression and feel great.
I bf'd through the last cycle and am currently bf'ing. DD is 32 months, and in daycare most days, so there's not a heck of a lot of bf'ing going on. I also night-weaned her after the last cycle.
I did a lot of research too - the IVF injectibles are not bio-available, which is why we have to inject. Which means very little gets into your milk. But I have noticed, both cycles, that there is a drop in supply when I start the birth control pill at the beginning of the cycle, and through suppression - gets better when I start stims. DD seems fine with that - as she's older it's not a big deal. I did put off cycling until she was 2, though, because I didn't want bf'ing to mess with the cycle, and vice versa. My dose of Puregon (stim) was higher last cycle as compared to 2004 as I didn't respond as favourably. That could be because of the bf'ing, but then again, I'm also older than I was. Time will tell. I also got more embryos last time than the first time (for all the good it did!).
I didn't tell my doctor that I was still bf'ing either. Not the most honest route.