Good attempt. All of your sentences make sense and I understood, however you can improve them just a little.
1. "After work I TAKE a swim in my pool, to HELP ease the stress from work. Or after work I GO for a swim in my pool, to HELP ease the stress from work.
Watch your spelling on after, you can use TAKE or GO as a better way to express yourself. As we go for a swim or take a swim, just like we go for a walk or go to the gym. You can also use " in order to ease the stress" as you have done, my use of HELP is so it sounds a little less formal. As this is an informal sentence.
2. Good job. Just remember "Do you still live ON the same street?" This is because, we don't live IN a street literally, we live IN a house/flat/apartment ON a street.
3. " Some people never SAY what's going on in their soul" or " some people never say what's going on within themselves/inside." Use SAY as we SAY something when we speak. But we will TELL someone the time if they ASK. If there is a problem we SAY what it is and we TELL if we are asked.
Hope this helps!