Glad you managed to get pictures attached now! That shrimp probably was a bacterial infection or something as that isn't a normal death! I had lots look like that though when my tank overheated because of a heater stuck on???
You could probably have left the filter running, that is normally where you get the most bacteria growing anyway.
The worms are probably just detritus worms and nothing to worry about, I doubt there is any tank without them when using soil substrate. The treatment I am sending, and the panaria zero won't probably kill those worms. I have had large patches of them in the past, it may be a sign you are overfeeding? They were more likely in the substrate rather than the plants.
When you top up for evaporation use pure rain (ro) water without gh/kh+, otherwise you will get a rise/build up in tds, evaporation is purely water and the tds are left in tht tank.
Simon