Congrats on 19 days, and getting back to sobriety. I can relate to the progression you mentioned above. After each period of abstinence, the volume of alcohol increased for me. That's the progression- it only moves forward as time goes on, never back.
Don't compare yourself to others or their recovery, it will only set you back. You have to run your own race, stay in your lane and make this the most important priority in your life. I'm in the same boat, only on day 2. But if I keep failing, I may not be graced with another day 2.
Stay strong and keep doing what your doing.