Hi there. I don't think I'm OCD but I'm struggling with mental health as well, and have done so especially in the first trimester (I'm 18 weeks now). Just wanted to send some mental support your way...
First of all, even if it doesn't feel like it at the moment, it will pass. Try to keep that in mind. And also, go easy on yourself, you're making a human! Don't feel bad for feeling tired, try to accept it and work around it. Find a few Netflix or Amazon Prime series you like and start binge-watching (without feeling bad about it!!) to pass the time and get your mind off of worrying.
I felt all kinds of terrible in the first trimester and even though I still have bad days, the good ones are slowly but surely piling up again. On top of the 'morning' sickness subsiding, most women also get their energy back in the second trimester.
Pregnancy related sick days are treated different than normal sick days, as in you shouldn't lose your job over them. There's some info online about it if you're worried about that. And again, you're making a human and your body is adjusting to that, don't make yourself feel bad about it. In my first trimester I cried nearly every morning before work, and in the end thoughts like, I'll go and try and if I can't do it anymore I'll just go home, got me through it day by day.
For birth fear, I have read the book 'Mindful Hypnobirthing: Hypnosis and mindfulness techniques for a calm and confident birth' and it really helped me! Don't get put off by the title... I found it very soothing and nurturing, and I'm actually a little excited now about giving birth. It comes with downloadable MP3 tracks which are great to fall asleep to by the way, no matter how busy your mind is with worrying.
I used to be absolutely terrified of vomiting as well... And of course I ended up vomiting daily for a while in my first trimester. Looking back though I think the fear of it was so much worse than it actually happening. I remember being a teenager and being terrified about getting morning sickness if I ever get pregnant... So many years of worrying for a few weeks that are already behind me now. And the whole thing cured my fear of it too ha ha... The only thing that would keep my morning sickness somewhat at bay was constantly eating tiny amounts of whatever it was I felt like I could stomach that day. I had to start eating straight after I woke up or I'd be dry-heaving after half an hour... That's a bit graphic sorry (skip this next bit if you're feeling squeamish), but I was terrified of eating as I didn't want to throw anything up, but if you have to throw up straight after you eat, it doesn't actually taste terrible. Also I ate things I thought were easy to throw up, like porridge or grapes, and made sure I drank a little with eating too. That took the fear out of it a little bit, and if it did happen it wasn't so bad... Plus I always carried a pot (yes...) or at least plastic bag around with me just in case it happens when I'm out and about. I always had time to get away actually, but it helped taking the fear out.
I know getting mental health help is a nightmare in itself right now, but I'd recommend signing up for that therapist asap. My GP told me that they should fast-track pregnant women (hasn't worked for me yet, but you might get better luck!) and even if that doesn't work, in 6 months time you will be glad you signed up now.
I wish you lots of strength, keep reminding yourself that it will pass, take it one moment at a time, and don't beat yourself up for feeling tired/sad/worried/too much or not enough. xxx