My poor dog is sick and I'm confused?

I took my 12 lb Shi-tzu to the vet with a distended tummy and congestion. She had xrays and it showed her gallbladder was much larger than normal. It also showed her stomach had a lot of air in it. The vet took some blood and this is where it gets even more confusing...her blood work showed her cholesterol was high and her triglycerides were very high. The only definitive answer I got was that the air in her tummy was from her swallowing air - really!? She had no answer for the swollen gallbladder, the high cholesterol and the very high triglycerides. She's getting an ultrasound on Monday to get a closer look at her gallbladder and see what kind of treatment is going to be necessary. All this took place on Tuesday and as of today (Thursday), she is even more congested, will eat only a few bites of food, sleeps most of the time and when I pick her up, she moans and I know her tummy must be hurting her. I called the vet again today and was told to give her 12.5 mg. of Benadryl 3 times a day for the congestion. The vet gave her a prescription of Albuteral for I guess, her breathing. I gave her a couple of doses but it didn't seem to help and it made her shake so bad, I didn't want to add to her misery. I'm confused and don't know what to do next. She's my best friend and I think I'm hurting more than she is (I doubt that but you get the point). Any answers would be nice. Thank you - Alex