Insomnia is SO bad, need advice

Do with my first pregnancy with my son, everything was pretty easy peasy. I got fatigue, and morning sickness, but I felt great for the most part. This time I am 30 weeks pregnant with my daughter and I have had terrible insomnia that started basically when I found out I was pregnant (actually it started right before I found out). I wake up in the middle of the night and literally lay there for HOURS. My mind just thinks, and thinks. Sometimes I end up focusing on negative things, like how much I hate my sister in law, and how crazy it is at work. But most of the time I just think about everything from to do lists, to baby girl names, to what I need to buy for her, etc. I then end up being SO incredibly tired, like I cannot even express how tired I am. It's making me feel very depressed, and angry. I not as good of a wife or mother this way. I started taking Benadryl every night, which I was so against because I hate taking anything while pregnant. It sort of helps, but not really enough. Please say there is someone else out there with some advice? Or it would even just be so nice to hear that someone else is going through this. After a bad night, sometimes I literally wake up and just cry because I don't know how I am going to make it through another day...