Hi, sorry to hear that you are feeling low, but pregnancy is such a strange time and has such an impact on how you feel physically and emotionally, so be kind to yourself. I had PND with my first child and am now 40 weeks (!) pregnant with my second. I would suggest talking to someone who can help e.g. Your GP, midwife, local Sure Start Centre; they will be able to listen and provide you with the support you need. I have had moments of real fear this pregnancy and I have found the most helpful things being getting out of the house and doing something to distract me, taking a walk, going to the supermarket...anything!, or talking to someone who is sympathetic like a close friend or family member.
It's ok to admit to feeling like you do, and I am sure not unusual to feel like you do. Reaching out for help is the important thing to get you back on track. Hope this helps, I totally get where you are coming from hope you feel better soon