Re: growth spurt? a cold? teething? reflux meds not working? something else?
I think it's teething. My son started teething at about 3 months and his first tooth popped at 4 months.
Try Hylands teething tablets. They are homeopathic and work pretty well- they just dissolve under the tongue, my son loves them I think they taste good or something. Also, tylenol for really bad days or before bed on occasion is what we use as well.
Teething can cause loose stools too!
There are tons of teething rings and you can put pacis, etc. in the fridge (my baby refuses all of these, ha).
On a side note, we're also using zantac and about the time he started teething I thought his reflux was getting worse so we also went to the Dr. They had to double his reflux meds because he had grown so much, but now that I think back it was probably teething and not reflux.
It does get better. Logan is teething again very hard this week he's working on his 2nd bottom tooth and I have found just plain old distraction using toys and walks outside is the best thing when he's super cranky.
Sleep, well yeah that's the worst part.... I hope it goes back to normal after this tooth!