D.W.
I commend you for acknowledging that you need to make the next step and for putting your son's best interests first.
My recommendation would be to get a family physician as quickly as possible.
Call your insurance or go to their website and see who the participating providers are. You'll also need to verify what kind of plan you and if a referral for a therapist is needed from your Primary Care provider. Then, you'll need to call offices to see who is accepting new patients. They'll need to see you for a physical at which you can explain your symptoms.
Primary care providers can certainly prescribe medications, but I'm a big believer in both medications (to balance hormones) and therapy to help talk through what's going on.
I'd been using SSRIs (antidepressent medications) prior to having both kids, but when I struggled with learning to live again after cancer, I chose to seek therapy - it helped me understand myself better than I could have on medication (I chose not to medicate following chemo).
There are several different medications on the market. Not every product will work the same in each patient. So, I'd recommend doing some research (preferably on trusted medical sites such as WebMD or MayoClinic.com, Google health, etc.) and asking the physician/pharmacist their opinion.
Here's some information that might help (this is not a comprehensive list):
SSRIs - Selective Seratonin Reuptake Inhibitors
Prozac (generic - fluoxetine)
Zoloft
Paxil
Celexa/Lexapro
SNRIs - Seratonin Norepinephrine Reuptake Inhibitors
Cymbalta
Pristiq/Effexor XR
There's also Abilify and Wellbutrin that work a little differently.
Best wishes! Hoping you find yourself on the other side of this soon.