Can't stand my son...

I'm sure I'll get hate over this, but I honestly want to know if this could be normal because of pregnancy hormones.

I'm 19 weeks pregnant and most days, I cannot stand my son. He will be 2 in August and is going through his terrible twos already. I didn't start getting snappy and annoyed at him before I got pregnant, but he also hadn't been going through his nonstop tantrums either.. He will literally throw an hour long (or more) tantrum if something doesn't go the way he wants it to..

I'm sleep deprived because he wakes up every hour of the night lately, and when he gets to sleep I cannot fall back to sleep quick enough before he is already awake again. I've been diagnosed as severely depressed and am on treatment but I honestly don't think it's doing anything for me. I feel like I'm going to go insane, I need a break but I don't have anyone to help me! I'm a single mom and I have no idea how I'm going to survive with two... could pregnancy hormones be causing me to feel like this, or am I just losing it? I feel horrible for feeling how I do, but it's just so hard!