Making those super smoothies that many here take in could be a key to helping. Now it won't help your swallowing improve but it will allow you to get some high calorie and nutritious stuff down easily.
So make your meal of the stuff you like smaller, let go of the stuff that is difficult or start putting it through a food processor first to break it down a little. If eating a meal takes more than 20 -30 minutes it's time to start new strategies. One of the things that happens is that it begins to take as much or more energy to consume the meal than the calories the meal contains and you are going backwards.
So if you cut down the meal size by a third or a half, and enjoyed eating it hot in one go, then drink a high powered smoothie either straight after or maybe half an hour to an hour later, you will have taken in more calories than before with far less energy spent.
Before Chris went onto puree I started putting parts of his meals through the food processor with the copping blade. It then still retained some texture, but made it so much easier to eat.