Hi mummyhelp - you are definitely not alone. Both you & Soggs took the right approach and didn't wait - I foolishly thought I would "get over" my panic & anxiety which began when my son was about 8 months old but it only got worse & worse until I finally realised last October that no, it wasn't normal that I was still crying in the toilet at work about not being a SAHM, and no, it wasn't healthy that I wouldn't do anything with my son that involved public transport unless I could overplan for about a week beforehand, etc etc plus depression and not sleeping!! I finally was diagnosed with PND when my son was nearly 3 and then got help, both in form of anti-depressants and some CBT therapy thru my GP/NHS.
Please be assured that it's very normal and far more common than most mums like to admit to, and my best advice would be to find the right kind of support for YOU - whether medication, counselling, complementary therapies, exercise or what have you!
Good luck! You are very welcome to PM me to chat more.