Stressing all sorts

Hi, new here...needed somewhere to offload. I'm 33 years old, 28 weeks with baby #2, ds is 7 years old so big age gap.
I've always felt a bit like a branch in the wind in that life is constantly buffeting me around. This preg has been stressful because first we were given notice to move from our granny flat as LL felt it wasn't suitable for a LO. Fine, we moved back to mums as housing market is ridiculous and have had a couple of credit probs in the past, so feel that it's unlikely anyone will give us a chance, though we had excellent refs from this LL. Back in one room all together, me, hubby and son. And will be here still when DD is born in March.
My "friend" of 20 years got assistant manager at work and has delighted since in controlling and undermining me, gleefully telling me that I was stuffed when she found out I was expecting. She is a single mum with 3 girls so I would have thought she would be there for me but it's been the opposite to the point where I can't go to work while she's there. Thankfully she is leaving in 3 weeks, but the damage to my rep at work is done. I am generally a good hard worker and while I have had my issues in the past have always worked through them, literally. The anxiety of this is causing me to worry for my baby though. In amongst all this, I lost my best little friend in the world, my 18 year old cat, who passed in my arms. I have been heartbroken about this, and it confirmed to me that my friend at work is no longer my friend when she didn't say one word to me about losing her. Not one word, and she knew what that cat meant to me. to say I am hurt would be a big understatement.
Now I'm feeling like every thing is hopeless. I love my family but I'm afraid of losing hubby as we've started fighting too. He thinks I need to speak up when I'm upset about stuff and the work thing with my "friend" is part my fault because I just try and keep my mouth shut and keep going. Hubby has his vices, which he says he will give up after Christmas, but I don't know..he has a stressful job. I have nothing, gave up smokes and drinks as soon as I found out about LO. Feel like I'm never going to get out of this trap I'm in, tired of being miserable, and always having huge piles of housework to do, as mum is 76 and set in her own chaotic ways, and the place is so cramped I keep ending up with mountains of clothes to just shove into the floor every night. How on earth am I going to fit a baby in here?? My ds is a comfort and doing really well but I feel like sometimes I'm a garbage mum to him already and how am I going to get on with a newborn???
Sorry for rant, gotta get stuff of my chest, trying not to panic as I know it's no good for bubby, and above all I want a healthy baby, and a happy family.