Oh, poor you, lola :( You sound very lonely & abandoned. I'm not surprised.
I made his sandwiches, he later text me to complain about them. I made him his favourite dinner for V day he later complained the dairy upset his stomach. I'm just constantly put down.
His response was that I didn't do what he expected me to when he wanted me to do it.
He expects you to do his bidding? Or even to anticipate what he wants & get it right? Complains when you 'fail' to be a mind-reading robot, basically.
I often feel I paranoid and a drama queen. I read the thread about gas lighting and I still feel sick to my stomach recognising it.
He is controlling you.
I feel I need some love ... I keep trying to make it better he keeps throwing it in my face
That "trying to make it better" feeling is what happens when someone treats you badly and tells you you're in the wrong for noticing. It's not good. Also, this level of stress and tiredness isn't good for your pregnancy. I'm glad you got your iron sorted out, you're going to need all the good health you can get!
You say he only started going out so much a few months ago. Is this when he started being so nasty to you, or has he always been a selfish twat?
If recent, he may be having an affair.
Please talk to someone you trust in real life, get some moral support.