terrified to fall pregnant again

I am so scared to fall pregnant again, literally terrified about it.
The though of it makes me breathless and depressed. My baby is 3.5 months old but this feeling has never changed ever since birth 
I don't know how I would cope if I fell pregnant again, will this feeling go away? Should I seek help for it? I get this anxiety feeling when I see pregnant people I need to leave the room just to breathe 
I really want kids in the future but I don't know how i can with this feeling. My birth was traumatic for me, so I'm scared the next will be the same
*Update*
Thank you for all your comments, I've been on the mini pill since bubba was six weeks, taking it religiously, and using condom as extra protection plus I breastfeed. Although I'm still doing all these I'm terrified :/ I'm hoping this feeling would go away soon