Third trimester blues

I’m 30 weeks pregnant with my first baby and started to feel really anxious, low, irritable and have intrusive thoughts. I have spoken to my GP and been referred for talking therapy but I’m reluctant to start taking any medication when I’ve made it this far without. I miss being social and fun and outdoors but don’t feel like doing anything or know what I enjoy anymore, I can’t exercise like I used to, I find the dog annoying and overstimulating and I’m constantly picking fault with my husband. Please don’t judge, I’m not a bad person, I just feel emotionally and physically depleted and like I need a holiday in a desert island with a strong cocktail. I’m wondering / hoping if there’s anyone out there who can resonate with me or share any hopeful stories of it getting better.