Sad during pregnancy?

I’m 30 weeks pregnant and the last few days I’ve felt every emotion x1000. One minute I’m angry, annoyed, frustrated and just want to scream, the next Im laughing, smiling and everything seems fine, then I’m back to being sad, crying and feeling like nobody cares. I have a toddler and don’t remember ever feeling this way when pregnant with her. I do have some serious complications with this baby, but I had preeclampsia with her so the high risk isn’t really new to me. Im not sure why I’ve had such strong mood swings lately. Im the type that when I start to feel sad or angry I throw myself into cleaning and such. I’ve rearranged my entire house to the point of pulling muscles in my lower stomach/leg because I’ve been over working my body non stop. I hate this feeling. Im sad most of the day, then get angry that I’m so sad and I swear the only thing that has brought me any sense of happiness is seeing how happy my daughter is that we’ve started setting up her brothers stuff. I don’t know what to do, or how to pull out of this funk.