B’shah tovah!
You sound very normal, and as a mamin says, you need to figure out a way to get some sleep — it makes a big difference.
Also, find ways to “escape” and relax, even if it means taking a slightly longer than usual shower and breathing slowly, or going for a short walk at night when it’s quite.
It always helped me to have friends to kvetch to who knew what I was feeling — but maybe that’s just cause I’m a kvetch!
A friend of mine once said “the purpose of the ninth month is to make you want to give birth!” — so true! Just remember gam zeh yaavar.
Herbal supplements may be helpful but NEVER take any medication (yes, herbal medications also affect your body chemically) without running it by your doctor first to make sure it’s ok. There are actually many herbal supplements that are NOT safe for pregnancy (although many are).
Good luck!