Even if you never get back your milk supply, PLEASE stop beating yourself up. You already know to turn off the TV. But whether that's really related to the breast milk -- can you be sure anyway?
Please realize, too, that in the long run he will be fine. And be aware that you are very lucky.
Here's some perspective for you: I could not produce ANY breast milk, ever, other than a trickle. I tried Reglan and fenugreek etc. and fed my daughter formula through tiny tubes taped to my nipples so she would at least learn to suckle until my milk magically appeared. But my body never would produce milk. So please take a deep breath and realize that being able to breastfeed even for that year and a half is great. And his health will not collapse, his bond with you will not be shattered, if you have to stop now. You sound very, very wound up about this, and I understand that, but he WILL get over his stress and will never remember it, frankly. Hard to hear and understand right now in your exhausted and upset state, but it's true.
The only thing to watch for is whether he will be able to take a bottle -- I introduced one because a lactation consultant said to do so or else the baby might have big difficulty taking one later. But my daughter at that time was a month old, and your son is 19 months, and should be able to cope with a sippy cup and not have to have a bottle. He will not let himself starve. (Though, yes, you should keep tabs on him with his doctor to ensure he's hydrated.) There will be the initial hard time with him fussing for the breast but if you cannot get the supply back despite your efforts, he will be OK-- unless your own stress causes him stress, which it is.
I know you have a lot of emotion invested in breastfeeding, and so did I for an utterly agonizing few months, but he will survive and so will you. He will not be coming to you at 18 to say "My bond with you is ruined because you dropped breastfeeding too early."
I hope this doesn't sound harsh. I mean it to be supportive and to say that in the larger scheme of things he and you will get through this. I have a much older child than yours and I know there are many bigger battles ahead for you than this one, though this one is particularly fraught with emotion and guilt right now. You are making huge efforts to get your milk back and do keep that up, BUT if it does not happen -- there must come a point where you accept that, stop the efforts, and move on, and do not let it affect your joy in your son because you are so upset you can't let it go. I know, I've been there. Be ready emotionally to accept this whichever way it goes, or you will be so distraught you will be unable to take pleasure in your own child for a long time. You don't want that. Let us know how it goes with an update.