Feeling way too emotional

I'm an emotional basket case lately. Anxious, angry, moody, sad, depressed, crying, yelling and more. It's awful I hate it and sometimes I hate myself. There is so much going on in life and I'm coming up on my sons birthday/passing. He'd be 4 this month and I can't believe that much time has passed. I wonder what he'd be like? 
Anyone else feel like they are "losing it?" Why does life get so complicated? It is so much easier to concentrate on one task at a time. I wish I could just be an incubator and a mom right now. I miss the thought of my 1st. I wonder about him all the time. Sigh 
Am I alone here? I don't think my husband gets it all. Why is it all so complicated? I can't even try and think of my future baby because I lost out on the first and that's all I did during that pregnancy and after the loss his response was "you knew this was a possibility" now he wants me to think of the baby whenever I get sad. Wtf?!?! 
Sorry to vent, so confused. I'm excited but nervous. I carried my first until full term and he never took a breath outside the womb. What if it happens again? They say the chances are so low but what if? Anyone else feeling this way? Anyone?