Hello again, Renea,
It is a relief to me to hear that you will be a lung transplant candidate once the smoking problem is licked, and it sounds like you are well on your way to that goal.
It saddens me that you haven't had the benefit of a good relationship with your pulmonary physician or your primary. You should have been told immediately just how grave a lung function of less than 30% is. Smoking cessation, using all tools at medicine's disposal, is one of the first steps in someone with poor lung function. How sad that you couldn't get the help you so desperately needed at the outset. I am sorry that your providers let you down.
Megace is the main drug prescribed for appetite improvement. That is actually a side effect of the drug (sort of like using Benadryl to get a good night's sleep. Benadryl is actually an antihistamine for allergies and the sleepiness is a side effect.). Nothing says it has to be Boost or Ensure if you don't like the taste. They are just easy for people to keep around. I personally abhor the taste as well. Anything you enjoy can be substituted. Making your own milkshake is fine. A scoop of protein powder from the pharmacy can't hurt.
If you like ice cream, then eat it as often as you like. Same for anything dense in calories that you like the taste of. This is one of the few times in one's life when it is good to eat whatever you want. You need the calories. Peanut butter (if you aren't allergic) is one of the highest calorie foods available, containing abuot 200 calories in just 2 tablespoons. Other nuts are also high in calories (almonds, pecans, walnuts, cashews). Dark chocolate is also good if you like sweets. Just one extra sandwich (add a slice of cheese for an extra 100 calories) a day adds 500 calories to your daily intake.
Fruit juices are higher in calories and less filling than the fruit, so it's better to drink 6-8 orange juice than to eat an orange. Pop it in the blender with orange sherbet or some vanilla ice cream if you like.
All pastas are fairly high in calories, regardless of the sauce. Whole wheat will give added fiber. Rich sauces (Alfredo, carbonara) add to the calorie load.
Among other high calorie foods are avocados, beans/legumes (not green beans), whole fat dairy, fatty fish like salmon and tuna, red meats, and potatoes. The omega-3 fatty acids in fish oils are thought to decrease inflammation and in some people improve appetite.
I'll keep my fingers crossed that you reach your goal of being smoke-free in the next week or two so you can get on the lung transplant list. Transplant is really the solution for you, since your physician is correct that the lungs are too far gone to repair themselves by the time your lung function is less than 30%.