new mom with low milk supply

Hello,
My baby is almost 3 months old, and I am having problems with breast feeding. in his first month my baby could not breastfeed at all, i had to pump my breast milk and feed him in a bottle. now since the past month he has been breast feeding, but my supply seems to be running low especially in the evenings, when he sucks for almost an hour, fusses a lot, yet seems to be hungry within 30-40 minutes. Ultimately I have to supplement with formula twice a day. my baby has been diagnosed with congenital hypothyroidism and is taking thyronorm 32 microgram everyday. he suffers from very irregular bowel movements, I give him Nat. Phos 6x 4 times a day, and he passes stool once in 2-3 days. on other days he suffers from gas, flatulence, stomach pain especially in the evenings. his sleep is very disturbed in the early morning, 5 a.m.- 7 a.m. I sincerely want to breastfeed my baby, please help.

I have been taking Calc. carb 30, three times a day, since the last 3 days. Also Alfalfa with Ginseng. will these help?

Also, I myself am hypothyroid and take 25 microgram of thyronorm daily.