I would suggest checking your leak rates. Also, depending on where you are in Russia, there are a lot of things in your diet that could affect your well being - Try and lower the fat load of your diet - Russian food can be very fatty, stay away from fast food there, even Rostik's (love their chicken), they load a lot of it with sugar which will play merry hell with your insulin levels, and, lastly, if you are not Russian and have only been there a few years, you really aren't used to the winters, the darkness if you are in any of the more northern regions (including Moscow and St. Petersburg) and that as well can make a mess of your biorhythms. Of course, you could also suffer from b12 and D deficiency, brought on by the cold dark weather. And of course, your thyroid can be out of whack.
Even with low AHI, btw, if you are doing self adjustment, please check your sO2sats. Sometimes even these low rates may be meaningless if your sO2sats are dropped. Since leaks and other problems can cause your reported AHI levels to drop, you need to be sure, and that is the best way to do so.