3 month regression??

Sky

My daughter is almost 15 weeks and oh boy have things turned upside down!! Im guessing its all part of the leap, growth spurt, and regression phase but I just want some reassurance on it! She had a perfect schedule of eating at 8am 12pm 4pm and 8pm 12am 4am and back again and would have wake times during the time that were timed perfectly and she'd go down for a nap until next feeding and it was all going smoothly! That is, until a week or so ago; and especially today!! Today she has been waking up every hour and will not go back to sleep ans just cries and screams and makes new high pitch sounds no matter what I do! She's constantly waking up from naps and just seems extremely fussy and cranky I don't know what to do please any tips or help???