Experiencing anxiety and panic post partum?

I had my baby 4.5 months ago and since then, I've been having really bad anxiety and panicking over everything and before having my baby I was never like this. I recently took a 30 minute (yes. 30 min) flight recently and felt like I was going to stop breathing I was freaking out so bad, even though I have flown overseas multiple times no problem before I had my baby. I also panic when there are thunderstorms, in the car, constantly checking if baby is breathing, afraid I'm going to drop him, freaking out while in the car, etc. I don't know if this is just normal and will go away or if it is more serious. Anyone else experience this?