Hi there lallies.
It is very hard when our little ones are not sleeping well or feeling well & you as a parent get sleep deprived!
Firstly, I see she suffers from constipation & reflux. These 2 can add to her not sleeping well. Do you offer some water in between feeds or with her solids?
Is she breastfed or formula fed as formula contains a high dose of iron which can add to the constipation & therefore babies need some extra fluids
Secondly, sleeping through is a developmental milestone that differs from baby to baby and children only really start sleeping through between age 2 - 5yrs. So, don't stress too much about that.
I know you said she did sleep through at one stage but babies go sleep regressions, growth spurts & about 10 wonder weeks before age 2
Babies still need some milk feeds throughout the night.
Rather take her to the paed so that you can sort that reflux & constipation out & take it from there.
Can you & your husband not make turns every 2nd night so you guys can get some sleep?