If the date is incorrect, and you are in the first three months, you could be developing a stricture. Please schedule an appointment with your surgeon to discuss the possibility, as it does require a medical procedure called an endoscopy to fix. In essence, as you heal, your body overcompensates and makes a lot of scar tissue that prevents food (and as time goes on, even liquid) from reaching your pouch. If this is happening, you will not be able to keep food down and there is a lot of nausea.
Second, regarding the nausea, are you drinking enough? It is VERY easy to become dehydrated after surgery and one of the first symptoms is nausea. I ended up in the ER twice for dehydration (because I had a stricture). Please, if you are having trouble keeping liquids down, see your doc ASAP.
Also (and again I am assuming your date is incorrect), you could also just have a "picky pouch" that is very sensitive to dense foods. It is common, but it does go away; you just have to keep trying, but not all at once. It took me four months before I could keep any solid food down. My nutritionist advised that I try one solid food a day and if that didn't work, to continue what I could eat, which was greek yogurt, s/f pudding, applesauce, and protein drinks (in other words, exactly what you are eating). Jiffy is right: experiment with different temps and textures. Ricotta cheese, refried beans, hummus, tofu, soft scrambled eggs...these are soft foods that you might try, if you haven't already. You just don't want to try everything all at once, because then you agitate an already sensitive stomach and make things worse.
Remorse/regret is normal. While everyone's advice to see a psychiatrist has merit, you are mourning the loss of your previous life. This is completely normal; you have changed your relationship with food, and if you were an emotional eater, you depended upon food when times were tough (or great). Since you can't depend on it any longer, you are feeling frustrated and upset. It gets better; it really does. Once your stomach starts to heal and you can eat healthier, you will feel better about the decision you made.
Also, please make sure you are consuming at least 60g of protein. It is hard to do, esp. when you can't eat enough, but you want to make sure you are meeting your protein requirements so that you can heal and your body won't take the protein it needs from your muscles. If need be, buy some unflavored protein powder and mix it with the applesauce or pudding that you are currently eating.
Finally, as hard as it is, try and walk a bit. From the day I was sent home, I was given an exercise regime. The first day I was to walk 10 minutes. Each day after that, it increased 2 minutes a day, until I was walking 30 minutes at a time. From there, I could do more, as long as I was moving 30 minutes at a time.
You can do this, my dear. Post your questions and concerns here and we will help you as much as we can. There is no reason for you to feel alone; we have been where you are. It does get better.