It gets better. It really, really does. But it also takes some noise at the doctors sometimes.
When I was at my worst, I could ring (or with my second, text) my midwife or health visitor (depending on whether gestating, newborn or next to newborn) who would get an appointment for me.
I suffer with intrusive thoughts which can also include unwanted imagery of situations which haven't happened (at least to me or my family) and this became worse after I first became a mum.
Talking it out is helpful and you've let out a lot on here. It would be super helpful if you could trust one of your friends enough to let them know you're actually feeling this way, it surprised me to learn how many people had the same anxieties as I did.
But you don't have to tell them either.
I do hope that you'll call or message or visit your GP or health visitor though.
If it makes you feel any better, I've got two kids and it's the one who I fed my from scratch home made stuff who has the tummy problems, where as my second had more jars and is fine. First was bottle, second was breast then bottle. Food is food. Honestly, if your cooking really isn't grand (I'm sure it's fine, sounds like anxiety but I'll believe you) then jars are fine. Puree, lumps, sticks or goo, it's all food.
You're also a good mum because you made this post. We can try to help.