Sounds like you have two different problems. The rotten spot on the bottom is probably blossom end rot and then the stink bugs. IMO, blossom end rot is caused by a plants inability to uptake calcium even though there is plenty of calcium in the soil. In my area of the world the surefire fix for this is to apply about 1/3 - 1/2 cup of epsom salts at the time of planting and when buds start to form. As far the stink bugs, they are also a problem I often have. The secret is to kill them while they are still nymphs. They are usually reddish orange with black legs and congregate together in groups of 20 - 30 while still young. At this stage they are easy to kill. A fairly strong dilution of dish washing soap will kill them. I prefer to use another organic pesticide, spinosad. It will also kill adult stink bugs but not immediately, plus it has a residual effect and it also acts as a deterrent. I would guess that the most popular brand of spinosad is by Bonide called Captain Jacks Dead Bug Killer, but there are many others as well. Pyrethrin and pyrethroids are also deadly against adult stink bugs.