maybe post pardum....not sure?

i had my beautiful baby boy 6 months ago and i was really depressed afterwards but only for about 2-3 weeks. lately ive been feeling the same as i was then anf im worried. ive been getting it in and off the past 6 months but only for about a day...its been almost 2 weeks now and I'm worried its taking a toll on my marriage cayse i know I'm being hormonal and irrational. i just dint know whether i should see someone or not...i was never diagnosed with ppd but i feel as though i should have been but it went away so fast i didn't think anything of it when it would come back little by little...i just need advice and what anyone has done if they've been through this...i feel really ashamed