Breastmilk supply. I couldn't do so.

I had pcod diabetes and thyroid before conceiving and took thyroxin and metsmall during my pregnancy and after delivery on june 30 my milk came in after 3 days. I took perinorm and my breasts were engorged then my baby started latching and I maintained a good supply for 2 months. But after her first vaccination at 6 weeks she starting feeding for less time due to gas and this continued till  the next dose at 10 weeks. Now from the past 2 3 days I am facing very low milk supply and my breasts doesn't leak and baby tummy is not full she needs to feed every hour in the afternoon till night. I can feel my breast are softer. I am taking lactare capsules and lactare granules.Has my diabetes pcod and thyroid has returned. What can be done as I want to exclusively breastfeed my second baby as with my first I couldn't do so.