I honestly am not sure what to do to get your parents to excercise. I would try to convince them with the scriptures somehow to exercise. If that didn't work, then I guess it would be left up to prayer.
As for your own health I would be praying for the Lord to heal you. As for the voices, I don't know. I just read C.S. Lewis's book the Screwtape Letters. This was the first C.S. Lewis book I had read. I enjoyed it. It was about a demonic entity taking orders from its hierarchy to destroy a newly converted Christian from the faith by giving him invisible impulses. C.S. Lewis said it was stressful to put his mind into a state to write the book, and he didn't think his readers or him could have stood another volume.
As for your enemies coming into your house at night. Keep waking up, because you don't know at what hour the Lord is coming as a thief in the night. There are multiple verses of this throughout the New Testament. Some of which we discussed in the other thread.
Revelation 3:1-6
Mark 13:32-37
28 Now learn a parable of the fig tree; When her branch is yet tender, and putteth forth leaves, ye know that summer is near:
29 So ye in like manner, when ye shall see these things come to pass, know that it is nigh, even at the doors.
30 Verily I say unto you, that this generation shall not pass, till all these things be done.
31 Heaven and earth shall pass away: but my words shall not pass away.
32 But of that day and that hour knoweth no man, no, not the angels which are in heaven, neither the Son, but the Father.
33 Take ye heed, watch and pray: for ye know not when the time is.
34 For the Son of Man is as a man taking a far journey, who left his house, and gave authority to his servants, and to every man his work, and commanded the porter to watch.
35 Watch ye therefore: for ye know not when the master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning:
36 Lest coming suddenly he find you sleeping.
37 And what I say unto you I say unto all, Watch