Hypothyroidism After Pregnancy?

Betthany • Stay at home wife and mother. Married my best friend Nick 6/28/14 and gave birth to our son Noah 1/4/15.

I was diagnosed with hypothyroidism when I was 14 (I'm now 23). I was on medication for a while, but at one point I had a doctor who believed I didn't need meds anymore. I guess my TSH was normal when I first got pregnant a year and a half ago (nothing was mentioned to me and I believe it was tested) However, now I'm having all the symptoms of hypothyroidism I used to have:

*weight gain (I lost weight directly following birth but slowly started gaining again within a week)

*sensitivity to cold

*brain fog (thought it was mommy brain at first)

*extreme fatigue

*hairs thin and falling out

Etc

So, my question is, has any one had the issue of thyroid problems following their pregnancy? I've recently gotten a new doctor, and need to fill out forms before they schedule my appointment. But, I am doing that and making an appointment this week hopefully.