You dismiss depression but it could be, why are you dismissing this?
Certainly grief - at the loss of the life you had planned and the baby lost.
29 is nothing honestly. You can't see it now but consider you'll likely live into your 90's and it makes it a little clearer.
I'm guessing it's your 30th birthday looming that also is having an effect.
At 30 I went back to uni - and divorced my cheating ex! I had a 2 year old in tow, was effectively evicted from my home and had NOTHING.
Since then I have earned my degree, raised a smart, funny & hardworking daughter, got a job I absolutely loved. Sadly ill health got in the way of the last and I'm currently not working.
I've friends who've been through similar and gone on to bigger & better too. One is now in Australia having a fabulous time in a great job.
One of my fellow uni students was in her 50's, recently divorced, made redundant from a large company that went under and was at uni to take her career and life in another direction. She is now thriving in the new career - where she met her fantastic new husband.
Focus on the pros of where you are now (regardless how you got there), you've no ties, sounds like you have your physical health.
Try things like meetup, further study, hobby groups to meet and make new friends. Learning a new skill can also give you something to focus on rather than dwelling on "God what if they all hate me!"
Get in contact with old friends, ask how they are, take an interest in their lives.
Where are you work wise? Doing something you love or treading water? Consider working toward a promotion or a complete change.
Do things you enjoy, but try to make it things that get you away from the same 4 walls.
YOU CAN DO THIS!