I think the leaps depend on the baby - my first baby was horrendous on a leap while with my second baby, I didn't notice so much of a change as she was generally quite easygoing. One thing they both shared was that their sleep would go haywire for the storm week. My first one particularly would stop sleeping in her basket and need all naps on me - moving. I walked miles and miles when she was at the same age yours is now to try to get 4 x 30 minute naps a day.
I would say that it sounds as though the reflux does need some attention. Have you discussed this with a HV, GP etc? Both of mine were medicated for reflux - My first would often save her vomiting for nap time which used to terrify me. It was around the three month mark that she was put on omeprazole and that made the days a lot calmer.
It is normal for BFd babies not to poo for anything up to 10 days and the poo can be different colours, so unless your baby is running a fever or showing other symptoms (besides the vomiting, assuming that's normal for them), I wouldn't get too fixated on that.
Motherhood (particularly early motherhood, and especially when you have a screamer) can be very isolating and lonely. I really recommend you get out of the house at least once a day to do SOMETHING. Someone said to me, "Well if they scream all the time, they might as well do it while you're doing something YOU enjoy" and they were so right.