I don't know if this will make you feel any better but . . .
When my sister travels, I take care of her cat. The cat has absolutely no problems except that, for some reason, it does not poop for about a week . . .it pees but no poop . . . the vet says that cats are extremely sensitive to changes in environments . . . I just let her go and do what she wants; there is food and clean water and treats, etc. The first time this happened, I called my sister in a panic . . . .I wanted to rush the cat to the vet, etc. and she said just wait it out . . . well, eventually the cat did a small amount of poo and by the time my sister returned about a week later, the cat was doing okay . . . .my sister took the cat home; it looked around and sniffed. Once my sister had placed the cat's kitty litter box in the regular place, the cat went in and unloaded about two weeks' worth . . . so, all of this to say, is that your cat might just be having a hard time adjusting to the new environment and, by the way, the vet said that I should not make a big deal over whether the cat poos or not because this, and I love this, might cause anxiety in the cat . . .so now, when the cat comes to stay, I just let it do what it wants; no fuss, no bother and it still takes about a week for it to be comfortable . . .
Now, as for your lights . . . you had an electrician install the fixture . . . it might just be a bad bulb so you could try changing the bulb . . . is the flow of electricity into your home steady? Do you live in a rural area? If it is intermittent and changing the bulb does not help, then call the electrician but for heaven's sake, staring at a light bulb will not do any good and will only add to your anxiety . . . now, if it is on a dimmer switch, that could be an issue . . .I had to have two of mine fixed because the wiring worked its way loose . . . .
So, do your best to distract yourself and let us know how you are doing . .. take care, kc