Cannot find the right formula for my baby boy. I breastfed for 2 weeks but quit bc of anxiety/baby blues and every time I fed him I bawled like a baby so going back is not an option. We tried similac pro advance and was fine for a few days but then became very fussy and was throwing 3 hour fits every night for 3 or 4 days. We switched to Gerber Soothe formula and dr.browns bottles and everything seemed perfect right away. After 3 days of that baby became very constipated. The pediatrician told us to try Enfamil reguline bc it is made for constipation. Baby screamed and screamed after every feeding from gas pains. I feel so frustrated and helpless. Any ideas on what else to try??