Hello! That's great that you have several appointments coming up, including with a headache specialist. Hopefully they can help you figure out some things to try that might get this to stop. Photophobia and phonophobia are both symptoms that often go along with migraine, and a headache doesn't always have to be present. People with migraine disease tend to be more sensitive to light and sound in between attacks than the general population. Rarely, you get a case where someone is chronically photophobic or phonophobic.
How soon is your doctor's appointment? That would be the biggest thing you can do at this point. I happen to be sort of an extreme case (severe chronic photophobia and phonophobia) but some measures you can take in the meantime would be to try to minimize your exposure to super-irritating sounds/light until you get in to see the doctor. Try to keep a diary of what sounds are most irritating so you can explain to the doctor in detail. Does it help to turn down the radio? Are metallic sounds or glass sounds worse than vibrating low hums?
With the light stuff, if it's an ongoing problem, and you feel you want to see someone else after the headache specialist, you might also consider seeing a neuro-opthamologist. There's a list of neuro-opthamologists who are also headache specialists. Of the n-o's I've seen, those have been the most beneficial in terms of understand light sensitivity. Other things you can do are to check out your light bulbs. One of my neuro-opth's, who is an expert on light sensitivity recommends light sensitive people use incandescent bulbs because those are the least irritating (their flickering is perceived the least by the brain.) Natural light is great since the sun doesn't flicker, and doesn't hurt at all as long as it's soft.
As far as sunglasses indoors, generally the recommendation is to try not to make it too dark for yourself because sometimes it can increase LS, so they make special rose-colored filtered glasses that get the worst wavelengths. The filter is called FL-41, and several companies sell them. Theraspecs, Axon Optics, and Moran Eye Institute Optical Shop are three I know of. They also make filtered sunglasses for outdoors. If your sunglasses for outdoors are polarized, that's good. If they aren't, get some polarized sunglasses. They'll cut the glare.
Screens. Screens can be a problem for LS people because they both emit light and flicker. They don't to my knowledge have any adapted TV or phones for LS. There are TONS of computer screen options. Depending on your level of sensitivity, you can get a filter to attach over your existing screen, you can get a LED screen that can turn down the blue and has a lower refresh rate, which makes it less irritating, and they even make e-ink screens that emit zero light and don't flicker at all. One is by Dasung called Paperlike, and the other is by Boox and called Max2. The latter is even a touch screen and can do all sorts of other stuff.
Anyway, don't want to overwhelm you with too much info. Please feel free to ask any questions.