No appetite after birth???

So my little guy is 3 months old almost 4 and since he s been born I've had no appetite like at all I have to force myself to eat and it's made my milk supply dwindle of course has anyone else had this problem or know what it could be I got up to 194 when pregnate and I'm down to 150 now I'm 5'6 I'm trying not to look like a stick but I can't eat nothing sounds good and I don't even get hunger pains??