Welcome, and congrats on getting your surgery! 20 pounds in two weeks is awesome.
The first few weeks are the hardest because you are very limited in what you can eat but you're not seeing all the rewards from the weight loss yet. The good news is that it gets easier! At two weeks out, you're probably either on purees or soft foods, right? It won't be too long before you can start eating real food (it may feel like an eternity, though). I've discovered some great new bariatric-friendly recipes on Pinterest that I really like. There are times when I miss being able to eat like I did before surgery, but at 6 months out, I'm getting used to my new eating habits and I'm loving my results.
I, too, have had to work on slowing down my eating. I bought a set of tiny forks and spoons (they are listed as cocktail forks/spoons if you want metal rather than plastic baby forks/spoons), which helps for taking smaller bites. I set a timer to go off every 30 seconds, and I try to chew for the first 30 seconds and then wait another 30 seconds to take the next bite (so 1 minute between bites).