Dezi,
I've had panic attacks, and struggled with anxiety in general, for about 15 years now.
Panic and anxiety aren't just a part of PTSD, they are stand-alone issues for some people too.
I went on Paxil for both anxiety and depression (years before my trauma), and it had cut down on the incidence of full-blown panic attacks, as well as just my general level of anxiety, for many years. Paxil kept me at a level of function that I was content with.
And then came my trauma & PTSD, which totally turned flipped the whole anxiety/panic thing on its ear. O-M-G. It's like 20x worse than it ever was... I never knew such levels of anxiety were even possible, before PTSD.

So I totally understand what you're saying.
I guess I would say this. Panic and anxiety are a function of brain chemistry (to put it very simply). Whatever it is that you've been through, has changed your brain, so now it is firing off like nuts with anxiety and panic.
Rescue meds (something you take reactively when you feel a panic attack coming on, like Valium) might not be the best approach for you. You and your doctor need to talk about this openly and honestly. You might be surprised; some GPs have a decent amount of experience with anxiety and panic. A daily prophylactic med, like an anti-depressant, might be a better fit for you. Some of them are considered better than others, for anxiety.
Not every anti-dep works the same, and there are going to be some that don't work well for you. Just because one doesn't work, doesn't mean they
all don't work. It just means you haven't tried the right one for your brain chemistry yet. Don't rule out the whole class of drugs just because one or two of them didn't work.
The reason I bring this up is because if you are home alone with the baby, taking a sedative like valium might not be a viable option. You need to have your "A-game" on, to take care of the baby.
As for acute panic attacks... what has always worked for me (although it might take hours!), is controlled breathing and reassuring self-talk. I learned it originally in police school :) it is a controlled breathing exercise they teach police officers to do every time they shoot their guns. Apparently when cops are involved in a shooting, they hold their breath. So they are taught to BREATHE (slow, deep, controlled breaths) and re-assess their surroundings. Since panic attacks feel like a threat to my personal safety

I used the firearms breathing thing to get through them. I slow down my breathing, and keep telling myself simply, "I am okay." Over and over and over again ... the key is CONTROL ... every second that I am not physically hurt by anything (magically falling ceiling, meteorite, spontaneous combustion of the carpeting, poltergeist, nuclear bomb going off in my backyard, etc.) I use that as evidence... "see? I'm still okay. I made it another second and I'm still okay. I - am - okay." And I keep paddling through it with I - am - okay until the attack subsides.
I used to spend hours in my college library's bathroom, in the throes of panic attacks. I would run up to the 5th floor, which I knew was really quiet ;) and it would be 2 or 3
hours before I could even leave the stall. It took a helluva lot of breathing and self-talk to get to that point.
I hope that you're able to find a technique and maybe even meds that will help you. :)
Bailey