Like you, my surgeon set me free to eat anything that could be chewed thoroughly (he said "to a liquid"). I also found that I could handle anything that fit that category.
While your outsides heal quickly it takes much longer for your insides to recover. Organs were moved around, your hernia was repaired, and your stomach was stretched, wrapped and stitched. It takes time for your upper GI tract to become accustomed to the changes and heal throughly. I was told it takes a full six months for the majority of healing and a year for the rest. I found that I continued to improve into the second year.
It is natural that your stomach would be reactive at this time. It has been through a lot! You might want to baby it a bit. Let your stomach tell what it likes and doesn't, and be understanding if it is unhappy so soon after surgery. It takes time to heal.
When you get something stuck, try to relax and just keep swallowing either room temperature water or warm tea. A warm drink helps to relax your esophagus and helps it work better.
When I was at your stage more experienced "wrappers" here told me that when something got stuck I should think of it like a "hairball" that cats get and need to cough up. I have found in all cases I was able to swallow whatever it was, rather than cough it up. Just try to keep your mind on chewing and swallowing when you're eating.
As far as vomiting, I don't know what your surgeon told you, but I was told by him and here that I should avoid vomiting at all cost, especially in the early stages of recovery. An episode of bad retching or vomiting can damage your wrap and make it fail.
That said, at the two year mark a vomiting bug snuck up on me. I didn't know if I'd be able to vomit (my surgeon said no), but I did. Immediately, though, I took my anti-nausea drugs to stop a repeat. This situation happened another year later.
If you haven't gotten a prescription for anti-nausea drugs, be sure to do so ASAP. You'll want to be prepared. I carry them wherever I go, just in case. Most here use Zofran and Phenegran. I've found suppository form Compazine works really well for me, although I take Zofran with me because a tablet form is more easily taken. With the Zofran, though, the dissolveable ones are preferred in my experience, as they melt under your tongue and can be absorbed that way. Once something gets into a sick stomach it's more likely it'll be vomited out before it starts to work.
It's totally normal that your stomach is fuller much more quickly than before. This is mostly due to residual swelling of the stomach, which is interpreted by the brain as fullness. This will resolve over time.
Remember you had major surgery (laproscopic procedures give the impression that healing is complete much earlier than it actually is), so it's totally natural to be more worn out. As time goes on you'll recover that energy. Be patient.
If you can surrender to your recovery (it seems that you have) and accept it as it is, you'll find things much easier. You can't rush it...your healing will happen in its own good time. It sounds as if everything is progressing as it should be.
Again, glad you've joined us!