T.C.
Step one: You must take care of yourself, because otherwise you won't be available for your boys.
Step two: get an M.D. to check you out, to rule out any physical problems (like thyroid issues). Tell him/her about your depression and suicidal thoughts and DO NOT LEAVE THE OFFICE without medication and/or a referral to a psychiatrist. I know it's hard but you have to be your own advocate.
Step three: work on your support network. Family, friends, pastor--whoever. You need it.
Step four: ditch the guilt. It's a luxury you cannot afford, and it's also illogical. You didn't ASK for any of this.
Step five: keep looking for counselors until you find a good one. Unfortunately, counseling/social work/psychology is a field full of people who got into this line of work because they flunked out of whatever it was they really wanted to do (brain surgeon or whatever). Good ones are out there but you have to look.
Also: Bowie Youth and Family Services (here in Bowie, obviously) offers free or low-cost therapy for families in crisis. Call Bowie City Hall or go on their website and get the number.