Keep up the good work Brother!
After physical and mental exertion is going to be somewhat of a hurdle for a while. This is when the body draws on whatever it needs to do the task. It's also a time the old signals of the smoking addiction tend to kick in too.
But you are doing great.

Eating some dill pickles will help with the indigestion. The vinegar is an acid that helps with proper digestion and the pickles have little to no calories in them. This fits well with the hydrocloric acid that your stomache normally produces to digest food.

As far as not sleeping well, it's important that you try to overcome this. Your body needs the rest and the calm. Sometimes working out or going for some good walks helps to tire and relax you enough to rest, especially after larger meals. Try to eat good, protien-rich foods that will help you relax. Turkey is very good for this due to the "tryptophan" content. Tryptophan can be obtained over the counter at many health food stores and taken as a suppliment, but I think it's better to get this naturally from foods. Still, it's a very good option as a natural tranquilizer and sleeping aid.
Breathing exersizes can help here too. When you are trying to rest, breath in slowly and not very deeply, through your nose. When you exhale, breath out through your nose, slowly and let your body relax. Breathing out slowly and completely as is comfortable and relaxing. That will help slow your heart rate and expell the CO2 better. Just sort of melt into a warm comfort. This aids the body to release any stress and the mental exersize tells your brain it's time to rest.

Also, eating a yogert 15 to 30 mins before sitting down to a meal will help too. This will help replace the good amino acids in your digestive tract. Yogert is an excellent, natural pro-biotic that carries very good enzymes and cultures your body really needs.

Keep in mind that the tars and nicotine from tabacco products are mostly assimulated through the stomache and the lungs second. This aspect of your body needing the 'oral gratification' is a common cause of people gaining weight while trying to quit smoking.
This aspect of 'oral gratification' is, in part, also why you are having some indigestion. Actually it's the lack of it that is mostly the cause. As a person smokes, it creates the sensation of eating which signals your stomache to produce more digestive fluids. When a person stops this mouth/smoking exersize, the stomache naturally produces less acids to digest foods. The biggest reason that smoking is so addictive. One of the larger reasons that many people crave a smoke right after dinner. It's better to put a slice of dill pickel in your mouth instead of a smoke. It has the same effect, maybe better.

Try to go easy on the cane sugar products, replacing these with natural Bee's Honey will be far better for you. (Bee's Honey still contains 14% to 17% sugar content, but it's a far better trade than pure refined cane sugar.)
Snacking on fruits and vegatables at this time are a better replacement for eating other things that might not be as good for you. This is also why drinking juices and soups are a good alternative to a somewhat heavier meal. These also help to keep you properly hydrated.

Hunger is 60% Thirst, Drink plenty before and with meals and you will tend not to gain unwanted weight.

There's a lot of chemical "Re-Balancing" that you are going through here, and it tends to require many habit changes too. Just try to stay as calm as possible and focus without stressing or working too hard at it. It will all come together in time and you'll feel much better for it. If you think about it, everything I've expressed so far, is way more to think about and do than it takes to smoke. Keeping your mind and body busy being heathy instead of smoking certainly fills in the time. It's a far better goal too!

I hope this helps. Keep going Brother! God's Speed.

Michael