I am 24 and I still suck my thumb....

I am 24 yrs old, I have a career, went to college, I have a son, I am married and: I STILL suck my thumb. My whole life I remember getting home from school, even as a teenager, and unwinding with a nap and I would just go to town on thumb sucking. When I was 16 and got a boyfriend, I was so embarressed of myself that I was able to kick the habit by locking away my baby blanket in my dad's hope chest. The blanket and thumb went hand in hand. I kicked the habit for 3 yrs. Then I had a miscarriage at 19 and burdened with emotional trauma and insomnia, I buckled and the thumb sucking came back full force. I sucked at night for comfort so I could get to sleep. In my current routine, I don't suck every night or at all during the day. I use it as a necessity now when I have been lying in bed for two hours, my husband and baby snoring away. It's really the last resort method that I constantly shame myself for using. I don't *think* my husband knows, at least he has never confronted me, but he's honestly too sweet to ever say something without me bringing the subject to the table. With that said, I am realistic. I doubt very much that he has never woken up first to find me with my thumb in my mouth. I have seen therapists throughout my life intermitently, but never spoke of my habit. It was always concerning my parents' divorce and emotionally destructive behaviour. I want to never suck my thumb again, but on those really bad anxious, nights I truly cannot help myself.

Where do I go from here?